<HighSchoolTimetableArchive>
  <Instances>
    <Instance Id="ArtificialSudoku4x4_XHSTT2011">
      <MetaData>
        <Name>Sudoku4x4</Name>
        <Contributor>Gerhard Post, University of Twente</Contributor>
        <Date>25/11/2009 16:44:55</Date>
        <Country>The Netherlands</Country>
        <Description>This dataset is a 4x4 Sudoku (initially empty).</Description>
        <Remarks>Dataset automatically created from SchoolTimeTablingProject.</Remarks>
      </MetaData>
      <Times>
        <TimeGroups>
          <Day Id="gr_Day">
            <Name>Day</Name>
          </Day>
          <TimeGroup Id="gr_AllTimes">
            <Name>AllTimes</Name>
          </TimeGroup>
          <TimeGroup Id="gr_TimesDurationTwo">
            <Name>TimesDurationTwo</Name>
          </TimeGroup>
        </TimeGroups>
        <Time Id="Day_1">
          <Name>Day_1</Name>
          <Day Reference="gr_Day"/>
          <TimeGroups>
            <TimeGroup Reference="gr_AllTimes"/>
          </TimeGroups>
        </Time>
        <Time Id="Day_2">
          <Name>Day_2</Name>
          <Day Reference="gr_Day"/>
          <TimeGroups>
            <TimeGroup Reference="gr_AllTimes"/>
          </TimeGroups>
        </Time>
        <Time Id="Day_3">
          <Name>Day_3</Name>
          <Day Reference="gr_Day"/>
          <TimeGroups>
            <TimeGroup Reference="gr_AllTimes"/>
          </TimeGroups>
        </Time>
        <Time Id="Day_4">
          <Name>Day_4</Name>
          <Day Reference="gr_Day"/>
          <TimeGroups>
            <TimeGroup Reference="gr_AllTimes"/>
          </TimeGroups>
        </Time>
      </Times>
      <Resources>
        <ResourceTypes>
          <ResourceType Id="Teacher">
            <Name>Teacher</Name>
          </ResourceType>
          <ResourceType Id="Class">
            <Name>Class</Name>
          </ResourceType>
          <ResourceType Id="Room">
            <Name>Room</Name>
          </ResourceType>
        </ResourceTypes>
        <ResourceGroups>
          <ResourceGroup Id="gr_Teachers">
            <Name>allTeachers</Name>
            <ResourceType Reference="Teacher"/>
          </ResourceGroup>
          <ResourceGroup Id="gr_Classes">
            <Name>allClasses</Name>
            <ResourceType Reference="Class"/>
          </ResourceGroup>
          <ResourceGroup Id="gr_Rooms">
            <Name>allRooms</Name>
            <ResourceType Reference="Room"/>
          </ResourceGroup>
          <ResourceGroup Id="gr_RT1">
            <Name>RT1</Name>
            <ResourceType Reference="Room"/>
          </ResourceGroup>
          <ResourceGroup Id="gr_RT2">
            <Name>RT2</Name>
            <ResourceType Reference="Room"/>
          </ResourceGroup>
          <ResourceGroup Id="gr_RT3">
            <Name>RT3</Name>
            <ResourceType Reference="Room"/>
          </ResourceGroup>
          <ResourceGroup Id="gr_RT4">
            <Name>RT4</Name>
            <ResourceType Reference="Room"/>
          </ResourceGroup>
        </ResourceGroups>
        <Resource Id="T1">
          <Name>T1</Name>
          <ResourceType Reference="Teacher"/>
          <ResourceGroups>
            <ResourceGroup Reference="gr_Teachers"/>
          </ResourceGroups>
        </Resource>
        <Resource Id="T2">
          <Name>T2</Name>
          <ResourceType Reference="Teacher"/>
          <ResourceGroups>
            <ResourceGroup Reference="gr_Teachers"/>
          </ResourceGroups>
        </Resource>
        <Resource Id="T3">
          <Name>T3</Name>
          <ResourceType Reference="Teacher"/>
          <ResourceGroups>
            <ResourceGroup Reference="gr_Teachers"/>
          </ResourceGroups>
        </Resource>
        <Resource Id="T4">
          <Name>T4</Name>
          <ResourceType Reference="Teacher"/>
          <ResourceGroups>
            <ResourceGroup Reference="gr_Teachers"/>
          </ResourceGroups>
        </Resource>
        <Resource Id="C1">
          <Name>C1</Name>
          <ResourceType Reference="Class"/>
          <ResourceGroups>
            <ResourceGroup Reference="gr_Classes"/>
          </ResourceGroups>
        </Resource>
        <Resource Id="C2">
          <Name>C2</Name>
          <ResourceType Reference="Class"/>
          <ResourceGroups>
            <ResourceGroup Reference="gr_Classes"/>
          </ResourceGroups>
        </Resource>
        <Resource Id="C3">
          <Name>C3</Name>
          <ResourceType Reference="Class"/>
          <ResourceGroups>
            <ResourceGroup Reference="gr_Classes"/>
          </ResourceGroups>
        </Resource>
        <Resource Id="C4">
          <Name>C4</Name>
          <ResourceType Reference="Class"/>
          <ResourceGroups>
            <ResourceGroup Reference="gr_Classes"/>
          </ResourceGroups>
        </Resource>
        <Resource Id="R1">
          <Name>R1</Name>
          <ResourceType Reference="Room"/>
          <ResourceGroups>
            <ResourceGroup Reference="gr_Rooms"/>
            <ResourceGroup Reference="gr_RT1"/>
          </ResourceGroups>
        </Resource>
        <Resource Id="R2">
          <Name>R2</Name>
          <ResourceType Reference="Room"/>
          <ResourceGroups>
            <ResourceGroup Reference="gr_Rooms"/>
            <ResourceGroup Reference="gr_RT2"/>
          </ResourceGroups>
        </Resource>
        <Resource Id="R3">
          <Name>R3</Name>
          <ResourceType Reference="Room"/>
          <ResourceGroups>
            <ResourceGroup Reference="gr_Rooms"/>
            <ResourceGroup Reference="gr_RT3"/>
          </ResourceGroups>
        </Resource>
        <Resource Id="R4">
          <Name>R4</Name>
          <ResourceType Reference="Room"/>
          <ResourceGroups>
            <ResourceGroup Reference="gr_Rooms"/>
            <ResourceGroup Reference="gr_RT4"/>
          </ResourceGroups>
        </Resource>
      </Resources>
      <Events>
        <EventGroups>
          <Course Id="gr_math-C1">
            <Name>math-C1</Name>
          </Course>
          <Course Id="gr_english-C1">
            <Name>english-C1</Name>
          </Course>
          <Course Id="gr_econ-C1">
            <Name>econ-C1</Name>
          </Course>
          <Course Id="gr_sports-C1">
            <Name>sports-C1</Name>
          </Course>
          <Course Id="gr_math-C2">
            <Name>math-C2</Name>
          </Course>
          <Course Id="gr_english-C2">
            <Name>english-C2</Name>
          </Course>
          <Course Id="gr_econ-C2">
            <Name>econ-C2</Name>
          </Course>
          <Course Id="gr_sports-C2">
            <Name>sports-C2</Name>
          </Course>
          <Course Id="gr_math-C3">
            <Name>math-C3</Name>
          </Course>
          <Course Id="gr_english-C3">
            <Name>english-C3</Name>
          </Course>
          <Course Id="gr_econ-C3">
            <Name>econ-C3</Name>
          </Course>
          <Course Id="gr_sports-C3">
            <Name>sports-C3</Name>
          </Course>
          <Course Id="gr_math-C4">
            <Name>math-C4</Name>
          </Course>
          <Course Id="gr_english-C4">
            <Name>english-C4</Name>
          </Course>
          <Course Id="gr_econ-C4">
            <Name>econ-C4</Name>
          </Course>
          <Course Id="gr_sports-C4">
            <Name>sports-C4</Name>
          </Course>
          <EventGroup Id="gr_AllEvents">
            <Name>EventsOfDurationOne</Name>
          </EventGroup>
          <EventGroup Id="gr_EventsRT1">
            <Name>RT1</Name>
          </EventGroup>
          <EventGroup Id="gr_EventsRT2">
            <Name>RT2</Name>
          </EventGroup>
          <EventGroup Id="gr_EventsRT3">
            <Name>RT3</Name>
          </EventGroup>
          <EventGroup Id="gr_EventsRT4">
            <Name>RT4</Name>
          </EventGroup>
        </EventGroups>
        <Event Id="Event1">
          <Name>math-C1_1</Name>
          <Duration>1</Duration>
          <Course Reference="gr_math-C1"/>
          <Resources>
            <Resource Reference="C1">
              <Role>Class</Role>
              <ResourceType Reference="Class"/>
            </Resource>
            <Resource Reference="T1">
              <Role>Teacher</Role>
              <ResourceType Reference="Teacher"/>
            </Resource>
            <Resource>
              <Role>RoomRT1</Role>
              <ResourceType Reference="Room"/>
            </Resource>
          </Resources>
          <EventGroups>
            <EventGroup Reference="gr_EventsRT1"/>
            <EventGroup Reference="gr_AllEvents"/>
          </EventGroups>
        </Event>
        <Event Id="Event2">
          <Name>english-C1_1</Name>
          <Duration>1</Duration>
          <Course Reference="gr_english-C1"/>
          <Resources>
            <Resource Reference="C1">
              <Role>Class</Role>
              <ResourceType Reference="Class"/>
            </Resource>
            <Resource Reference="T2">
              <Role>Teacher</Role>
              <ResourceType Reference="Teacher"/>
            </Resource>
            <Resource>
              <Role>RoomRT1</Role>
              <ResourceType Reference="Room"/>
            </Resource>
          </Resources>
          <EventGroups>
            <EventGroup Reference="gr_EventsRT1"/>
            <EventGroup Reference="gr_AllEvents"/>
          </EventGroups>
        </Event>
        <Event Id="Event3">
          <Name>econ-C1_1</Name>
          <Duration>1</Duration>
          <Course Reference="gr_econ-C1"/>
          <Resources>
            <Resource Reference="C1">
              <Role>Class</Role>
              <ResourceType Reference="Class"/>
            </Resource>
            <Resource Reference="T3">
              <Role>Teacher</Role>
              <ResourceType Reference="Teacher"/>
            </Resource>
            <Resource>
              <Role>RoomRT2</Role>
              <ResourceType Reference="Room"/>
            </Resource>
          </Resources>
          <EventGroups>
            <EventGroup Reference="gr_EventsRT2"/>
            <EventGroup Reference="gr_AllEvents"/>
          </EventGroups>
        </Event>
        <Event Id="Event4">
          <Name>sports-C1_1</Name>
          <Duration>1</Duration>
          <Course Reference="gr_sports-C1"/>
          <Resources>
            <Resource Reference="C1">
              <Role>Class</Role>
              <ResourceType Reference="Class"/>
            </Resource>
            <Resource Reference="T4">
              <Role>Teacher</Role>
              <ResourceType Reference="Teacher"/>
            </Resource>
            <Resource>
              <Role>RoomRT2</Role>
              <ResourceType Reference="Room"/>
            </Resource>
          </Resources>
          <EventGroups>
            <EventGroup Reference="gr_EventsRT2"/>
            <EventGroup Reference="gr_AllEvents"/>
          </EventGroups>
        </Event>
        <Event Id="Event5">
          <Name>math-C2_1</Name>
          <Duration>1</Duration>
          <Course Reference="gr_math-C2"/>
          <Resources>
            <Resource Reference="C2">
              <Role>Class</Role>
              <ResourceType Reference="Class"/>
            </Resource>
            <Resource Reference="T1">
              <Role>Teacher</Role>
              <ResourceType Reference="Teacher"/>
            </Resource>
            <Resource>
              <Role>RoomRT1</Role>
              <ResourceType Reference="Room"/>
            </Resource>
          </Resources>
          <EventGroups>
            <EventGroup Reference="gr_EventsRT1"/>
            <EventGroup Reference="gr_AllEvents"/>
          </EventGroups>
        </Event>
        <Event Id="Event6">
          <Name>english-C2_1</Name>
          <Duration>1</Duration>
          <Course Reference="gr_english-C2"/>
          <Resources>
            <Resource Reference="C2">
              <Role>Class</Role>
              <ResourceType Reference="Class"/>
            </Resource>
            <Resource Reference="T2">
              <Role>Teacher</Role>
              <ResourceType Reference="Teacher"/>
            </Resource>
            <Resource>
              <Role>RoomRT1</Role>
              <ResourceType Reference="Room"/>
            </Resource>
          </Resources>
          <EventGroups>
            <EventGroup Reference="gr_EventsRT1"/>
            <EventGroup Reference="gr_AllEvents"/>
          </EventGroups>
        </Event>
        <Event Id="Event7">
          <Name>econ-C2_1</Name>
          <Duration>1</Duration>
          <Course Reference="gr_econ-C2"/>
          <Resources>
            <Resource Reference="C2">
              <Role>Class</Role>
              <ResourceType Reference="Class"/>
            </Resource>
            <Resource Reference="T3">
              <Role>Teacher</Role>
              <ResourceType Reference="Teacher"/>
            </Resource>
            <Resource>
              <Role>RoomRT2</Role>
              <ResourceType Reference="Room"/>
            </Resource>
          </Resources>
          <EventGroups>
            <EventGroup Reference="gr_EventsRT2"/>
            <EventGroup Reference="gr_AllEvents"/>
          </EventGroups>
        </Event>
        <Event Id="Event8">
          <Name>sports-C2_1</Name>
          <Duration>1</Duration>
          <Course Reference="gr_sports-C2"/>
          <Resources>
            <Resource Reference="C2">
              <Role>Class</Role>
              <ResourceType Reference="Class"/>
            </Resource>
            <Resource Reference="T4">
              <Role>Teacher</Role>
              <ResourceType Reference="Teacher"/>
            </Resource>
            <Resource>
              <Role>RoomRT2</Role>
              <ResourceType Reference="Room"/>
            </Resource>
          </Resources>
          <EventGroups>
            <EventGroup Reference="gr_EventsRT2"/>
            <EventGroup Reference="gr_AllEvents"/>
          </EventGroups>
        </Event>
        <Event Id="Event9">
          <Name>math-C3_1</Name>
          <Duration>1</Duration>
          <Course Reference="gr_math-C3"/>
          <Resources>
            <Resource Reference="C3">
              <Role>Class</Role>
              <ResourceType Reference="Class"/>
            </Resource>
            <Resource Reference="T1">
              <Role>Teacher</Role>
              <ResourceType Reference="Teacher"/>
            </Resource>
            <Resource>
              <Role>RoomRT3</Role>
              <ResourceType Reference="Room"/>
            </Resource>
          </Resources>
          <EventGroups>
            <EventGroup Reference="gr_EventsRT3"/>
            <EventGroup Reference="gr_AllEvents"/>
          </EventGroups>
        </Event>
        <Event Id="Event10">
          <Name>english-C3_1</Name>
          <Duration>1</Duration>
          <Course Reference="gr_english-C3"/>
          <Resources>
            <Resource Reference="C3">
              <Role>Class</Role>
              <ResourceType Reference="Class"/>
            </Resource>
            <Resource Reference="T2">
              <Role>Teacher</Role>
              <ResourceType Reference="Teacher"/>
            </Resource>
            <Resource>
              <Role>RoomRT3</Role>
              <ResourceType Reference="Room"/>
            </Resource>
          </Resources>
          <EventGroups>
            <EventGroup Reference="gr_EventsRT3"/>
            <EventGroup Reference="gr_AllEvents"/>
          </EventGroups>
        </Event>
        <Event Id="Event11">
          <Name>econ-C3_1</Name>
          <Duration>1</Duration>
          <Course Reference="gr_econ-C3"/>
          <Resources>
            <Resource Reference="C3">
              <Role>Class</Role>
              <ResourceType Reference="Class"/>
            </Resource>
            <Resource Reference="T3">
              <Role>Teacher</Role>
              <ResourceType Reference="Teacher"/>
            </Resource>
            <Resource>
              <Role>RoomRT4</Role>
              <ResourceType Reference="Room"/>
            </Resource>
          </Resources>
          <EventGroups>
            <EventGroup Reference="gr_EventsRT4"/>
            <EventGroup Reference="gr_AllEvents"/>
          </EventGroups>
        </Event>
        <Event Id="Event12">
          <Name>sports-C3_1</Name>
          <Duration>1</Duration>
          <Course Reference="gr_sports-C3"/>
          <Resources>
            <Resource Reference="C3">
              <Role>Class</Role>
              <ResourceType Reference="Class"/>
            </Resource>
            <Resource Reference="T4">
              <Role>Teacher</Role>
              <ResourceType Reference="Teacher"/>
            </Resource>
            <Resource>
              <Role>RoomRT4</Role>
              <ResourceType Reference="Room"/>
            </Resource>
          </Resources>
          <EventGroups>
            <EventGroup Reference="gr_EventsRT4"/>
            <EventGroup Reference="gr_AllEvents"/>
          </EventGroups>
        </Event>
        <Event Id="Event13">
          <Name>math-C4_1</Name>
          <Duration>1</Duration>
          <Course Reference="gr_math-C4"/>
          <Resources>
            <Resource Reference="C4">
              <Role>Class</Role>
              <ResourceType Reference="Class"/>
            </Resource>
            <Resource Reference="T1">
              <Role>Teacher</Role>
              <ResourceType Reference="Teacher"/>
            </Resource>
            <Resource>
              <Role>RoomRT3</Role>
              <ResourceType Reference="Room"/>
            </Resource>
          </Resources>
          <EventGroups>
            <EventGroup Reference="gr_EventsRT3"/>
            <EventGroup Reference="gr_AllEvents"/>
          </EventGroups>
        </Event>
        <Event Id="Event14">
          <Name>english-C4_1</Name>
          <Duration>1</Duration>
          <Course Reference="gr_english-C4"/>
          <Resources>
            <Resource Reference="C4">
              <Role>Class</Role>
              <ResourceType Reference="Class"/>
            </Resource>
            <Resource Reference="T2">
              <Role>Teacher</Role>
              <ResourceType Reference="Teacher"/>
            </Resource>
            <Resource>
              <Role>RoomRT3</Role>
              <ResourceType Reference="Room"/>
            </Resource>
          </Resources>
          <EventGroups>
            <EventGroup Reference="gr_EventsRT3"/>
            <EventGroup Reference="gr_AllEvents"/>
          </EventGroups>
        </Event>
        <Event Id="Event15">
          <Name>econ-C4_1</Name>
          <Duration>1</Duration>
          <Course Reference="gr_econ-C4"/>
          <Resources>
            <Resource Reference="C4">
              <Role>Class</Role>
              <ResourceType Reference="Class"/>
            </Resource>
            <Resource Reference="T3">
              <Role>Teacher</Role>
              <ResourceType Reference="Teacher"/>
            </Resource>
            <Resource>
              <Role>RoomRT4</Role>
              <ResourceType Reference="Room"/>
            </Resource>
          </Resources>
          <EventGroups>
            <EventGroup Reference="gr_EventsRT4"/>
            <EventGroup Reference="gr_AllEvents"/>
          </EventGroups>
        </Event>
        <Event Id="Event16">
          <Name>sports-C4_1</Name>
          <Duration>1</Duration>
          <Course Reference="gr_sports-C4"/>
          <Resources>
            <Resource Reference="C4">
              <Role>Class</Role>
              <ResourceType Reference="Class"/>
            </Resource>
            <Resource Reference="T4">
              <Role>Teacher</Role>
              <ResourceType Reference="Teacher"/>
            </Resource>
            <Resource>
              <Role>RoomRT4</Role>
              <ResourceType Reference="Room"/>
            </Resource>
          </Resources>
          <EventGroups>
            <EventGroup Reference="gr_EventsRT4"/>
            <EventGroup Reference="gr_AllEvents"/>
          </EventGroups>
        </Event>
      </Events>
      <Constraints>
        <AssignResourceConstraint Id="AssignResources_1">
          <Name>AssignResourcesRT1</Name>
          <Required>true</Required>
          <Weight>1</Weight>
          <CostFunction>Sum</CostFunction>
          <AppliesTo>
            <EventGroups>
              <EventGroup Reference="gr_EventsRT1"/>
            </EventGroups>
          </AppliesTo>
          <Role>RoomRT1</Role>
        </AssignResourceConstraint>
        <AssignResourceConstraint Id="AssignResources_2">
          <Name>AssignResourcesRT2</Name>
          <Required>true</Required>
          <Weight>1</Weight>
          <CostFunction>Sum</CostFunction>
          <AppliesTo>
            <EventGroups>
              <EventGroup Reference="gr_EventsRT2"/>
            </EventGroups>
          </AppliesTo>
          <Role>RoomRT2</Role>
        </AssignResourceConstraint>
        <AssignResourceConstraint Id="AssignResources_3">
          <Name>AssignResourcesRT3</Name>
          <Required>true</Required>
          <Weight>1</Weight>
          <CostFunction>Sum</CostFunction>
          <AppliesTo>
            <EventGroups>
              <EventGroup Reference="gr_EventsRT3"/>
            </EventGroups>
          </AppliesTo>
          <Role>RoomRT3</Role>
        </AssignResourceConstraint>
        <AssignResourceConstraint Id="AssignResources_4">
          <Name>AssignResourcesRT4</Name>
          <Required>true</Required>
          <Weight>1</Weight>
          <CostFunction>Sum</CostFunction>
          <AppliesTo>
            <EventGroups>
              <EventGroup Reference="gr_EventsRT4"/>
            </EventGroups>
          </AppliesTo>
          <Role>RoomRT4</Role>
        </AssignResourceConstraint>
        <AssignTimeConstraint Id="AssignTimes_5">
          <Name>AssignTimes</Name>
          <Required>true</Required>
          <Weight>1</Weight>
          <CostFunction>Sum</CostFunction>
          <AppliesTo>
            <EventGroups>
              <EventGroup Reference="gr_AllEvents"/>
            </EventGroups>
          </AppliesTo>
        </AssignTimeConstraint>
        <PreferResourcesConstraint Id="PreferredResources_6">
          <Name>PreferredResourcesRT1</Name>
          <Required>true</Required>
          <Weight>1</Weight>
          <CostFunction>Sum</CostFunction>
          <AppliesTo>
            <EventGroups>
              <EventGroup Reference="gr_EventsRT1"/>
            </EventGroups>
          </AppliesTo>
          <ResourceGroups>
            <ResourceGroup Reference="gr_RT1"/>
          </ResourceGroups>
          <Role>RoomRT1</Role>
        </PreferResourcesConstraint>
        <PreferResourcesConstraint Id="PreferredResources_7">
          <Name>PreferredResourcesRT2</Name>
          <Required>true</Required>
          <Weight>1</Weight>
          <CostFunction>Sum</CostFunction>
          <AppliesTo>
            <EventGroups>
              <EventGroup Reference="gr_EventsRT2"/>
            </EventGroups>
          </AppliesTo>
          <ResourceGroups>
            <ResourceGroup Reference="gr_RT2"/>
          </ResourceGroups>
          <Role>RoomRT2</Role>
        </PreferResourcesConstraint>
        <PreferResourcesConstraint Id="PreferredResources_8">
          <Name>PreferredResourcesRT3</Name>
          <Required>true</Required>
          <Weight>1</Weight>
          <CostFunction>Sum</CostFunction>
          <AppliesTo>
            <EventGroups>
              <EventGroup Reference="gr_EventsRT3"/>
            </EventGroups>
          </AppliesTo>
          <ResourceGroups>
            <ResourceGroup Reference="gr_RT3"/>
          </ResourceGroups>
          <Role>RoomRT3</Role>
        </PreferResourcesConstraint>
        <PreferResourcesConstraint Id="PreferredResources_9">
          <Name>PreferredResourcesRT4</Name>
          <Required>true</Required>
          <Weight>1</Weight>
          <CostFunction>Sum</CostFunction>
          <AppliesTo>
            <EventGroups>
              <EventGroup Reference="gr_EventsRT4"/>
            </EventGroups>
          </AppliesTo>
          <ResourceGroups>
            <ResourceGroup Reference="gr_RT4"/>
          </ResourceGroups>
          <Role>RoomRT4</Role>
        </PreferResourcesConstraint>
        <PreferTimesConstraint Id="PreferredTimes_10">
          <Name>PreferredTimes</Name>
          <Required>true</Required>
          <Weight>1</Weight>
          <CostFunction>Sum</CostFunction>
          <AppliesTo>
            <EventGroups>
              <EventGroup Reference="gr_AllEvents"/>
            </EventGroups>
          </AppliesTo>
          <TimeGroups>
            <TimeGroup Reference="gr_AllTimes"/>
          </TimeGroups>
        </PreferTimesConstraint>
        <AvoidClashesConstraint Id="NoResourceClashes_13">
          <Name>NoResourceClashes</Name>
          <Required>true</Required>
          <Weight>1</Weight>
          <CostFunction>Sum</CostFunction>
          <AppliesTo>
            <ResourceGroups>
              <ResourceGroup Reference="gr_Teachers"/>
              <ResourceGroup Reference="gr_Rooms"/>
              <ResourceGroup Reference="gr_Classes"/>
            </ResourceGroups>
          </AppliesTo>
        </AvoidClashesConstraint>
      </Constraints>
    </Instance>
  </Instances>
  <SolutionGroups>
    <SolutionGroup Id="GerhardPost_2009-04-29">
      <MetaData>
        <Contributor>Gerhard Post, University of Twente</Contributor>
        <Date>25/11/2009 16:44:55</Date>
        <Description>4x4 Sudoku, initially empty.</Description>
      </MetaData>
      <Solution Reference="ArtificialSudoku4x4_XHSTT2011">
        <Events>
          <Event Reference="Event1">
            <Time Reference="Day_1"/>
            <Resources>
              <Resource Reference="R1">
                <Role>RoomRT1</Role>
              </Resource>
            </Resources>
          </Event>
          <Event Reference="Event2">
            <Time Reference="Day_2"/>
            <Resources>
              <Resource Reference="R1">
                <Role>RoomRT1</Role>
              </Resource>
            </Resources>
          </Event>
          <Event Reference="Event3">
            <Time Reference="Day_3"/>
            <Resources>
              <Resource Reference="R2">
                <Role>RoomRT2</Role>
              </Resource>
            </Resources>
          </Event>
          <Event Reference="Event4">
            <Time Reference="Day_4"/>
            <Resources>
              <Resource Reference="R2">
                <Role>RoomRT2</Role>
              </Resource>
            </Resources>
          </Event>
          <Event Reference="Event5">
            <Time Reference="Day_3"/>
            <Resources>
              <Resource Reference="R1">
                <Role>RoomRT1</Role>
              </Resource>
            </Resources>
          </Event>
          <Event Reference="Event6">
            <Time Reference="Day_4"/>
            <Resources>
              <Resource Reference="R1">
                <Role>RoomRT1</Role>
              </Resource>
            </Resources>
          </Event>
          <Event Reference="Event7">
            <Time Reference="Day_1"/>
            <Resources>
              <Resource Reference="R2">
                <Role>RoomRT2</Role>
              </Resource>
            </Resources>
          </Event>
          <Event Reference="Event8">
            <Time Reference="Day_2"/>
            <Resources>
              <Resource Reference="R2">
                <Role>RoomRT2</Role>
              </Resource>
            </Resources>
          </Event>
          <Event Reference="Event9">
            <Time Reference="Day_2"/>
            <Resources>
              <Resource Reference="R3">
                <Role>RoomRT3</Role>
              </Resource>
            </Resources>
          </Event>
          <Event Reference="Event10">
            <Time Reference="Day_1"/>
            <Resources>
              <Resource Reference="R3">
                <Role>RoomRT3</Role>
              </Resource>
            </Resources>
          </Event>
          <Event Reference="Event11">
            <Time Reference="Day_4"/>
            <Resources>
              <Resource Reference="R4">
                <Role>RoomRT4</Role>
              </Resource>
            </Resources>
          </Event>
          <Event Reference="Event12">
            <Time Reference="Day_3"/>
            <Resources>
              <Resource Reference="R4">
                <Role>RoomRT4</Role>
              </Resource>
            </Resources>
          </Event>
          <Event Reference="Event13">
            <Time Reference="Day_4"/>
            <Resources>
              <Resource Reference="R3">
                <Role>RoomRT3</Role>
              </Resource>
            </Resources>
          </Event>
          <Event Reference="Event14">
            <Time Reference="Day_3"/>
            <Resources>
              <Resource Reference="R3">
                <Role>RoomRT3</Role>
              </Resource>
            </Resources>
          </Event>
          <Event Reference="Event15">
            <Time Reference="Day_2"/>
            <Resources>
              <Resource Reference="R4">
                <Role>RoomRT4</Role>
              </Resource>
            </Resources>
          </Event>
          <Event Reference="Event16">
            <Time Reference="Day_1"/>
            <Resources>
              <Resource Reference="R4">
                <Role>RoomRT4</Role>
              </Resource>
            </Resources>
          </Event>
        </Events>
      </Solution>
    </SolutionGroup>
  </SolutionGroups>
</HighSchoolTimetableArchive>
