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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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<CDName>poset1</CDName>
<CDReviewDate>2009-06-26</CDReviewDate>
<CDDate>2009-06-26</CDDate>
<CDVersion>1</CDVersion>
<CDRevision>0</CDRevision>
<CDStatus>private</CDStatus>

<Description>
This is a private CD to represent lattices of subgroups. 
</Description>

<CDDefinition>
<Name>vertex</Name>
<Description> 
Represents a vertex of the diagram (a subgroup of the group). 
The first argument is its label, the second argument is the 
list of labels of its subgroups.
</Description>
</CDDefinition>

<CDDefinition>
<Name>class</Name>
<Description> 
Represents conjugacy class of subgroups. The argument is the list
of vertices. 
</Description>
</CDDefinition>

<CDDefinition>
<Name>level</Name>
<Description> 
Represents a level of the diagram. The first argument is the index,
the second argument is the list of classes.
</Description>
</CDDefinition>

<CDDefinition>
<Name>poset_diagram</Name>
<Description> 
Represents the poset diagram (lattice of subgroups). The argument is 
the list of levels.
</Description>

</FMP>
<OMOBJ>
	<OMA>
		<OMS cd="poset1" name="poset_diagram"/>
		<OMA>
			<OMS cd="poset1" name="level"/>
			<OMI>1</OMI>
			<OMA>
				<OMS cd="list1" name="list"/>
				<OMA>
					<OMS cd="poset1" name="class"/>
					<OMA>
						<OMS cd="list1" name="list"/>
						<OMA>
							<OMS cd="poset1" name="vertex"/>
							<OMSTR>G</OMSTR>
							<OMA>
								<OMS cd="list1" name="list"/>
								<OMSTR>3</OMSTR>
								<OMSTR>2.1</OMSTR>
								<OMSTR>2.2</OMSTR>
								<OMSTR>2.3</OMSTR>
							</OMA>
						</OMA>
					</OMA>
				</OMA>
			</OMA>
		</OMA>
		<OMA>
			<OMS cd="poset1" name="level"/>
			<OMI>2</OMI>
			<OMA>
				<OMS cd="list1" name="list"/>
				<OMA>
					<OMS cd="poset1" name="class"/>
					<OMA>
						<OMS cd="list1" name="list"/>
						<OMA>
							<OMS cd="poset1" name="vertex"/>
							<OMSTR>3</OMSTR>
							<OMA>
								<OMS cd="list1" name="list"/>
								<OMSTR>1</OMSTR>
							</OMA>
						</OMA>
					</OMA>
				</OMA>
			</OMA>
		</OMA>
		<OMA>
			<OMS cd="poset1" name="level"/>
			<OMI>3</OMI>
			<OMA>
				<OMS cd="list1" name="list"/>
				<OMA>
					<OMS cd="poset1" name="class"/>
					<OMA>
						<OMS cd="list1" name="list"/>
						<OMA>
							<OMS cd="poset1" name="vertex"/>
							<OMSTR>2.1</OMSTR>
							<OMA>
								<OMS cd="list1" name="list"/>
								<OMSTR>1</OMSTR>
							</OMA>
						</OMA>
						<OMA>
							<OMS cd="poset1" name="vertex"/>
							<OMSTR>2.2</OMSTR>
							<OMA>
								<OMS cd="list1" name="list"/>
								<OMSTR>1</OMSTR>
							</OMA>
						</OMA>
						<OMA>
							<OMS cd="poset1" name="vertex"/>
							<OMSTR>2.3</OMSTR>
							<OMA>
								<OMS cd="list1" name="list"/>
								<OMSTR>1</OMSTR>
							</OMA>
						</OMA>
					</OMA>
				</OMA>
			</OMA>
		</OMA>
		<OMA>
			<OMS cd="poset1" name="level"/>
			<OMI>6</OMI>
			<OMA>
				<OMS cd="list1" name="list"/>
				<OMA>
					<OMS cd="poset1" name="class"/>
					<OMA>
						<OMS cd="list1" name="list"/>
						<OMA>
							<OMS cd="poset1" name="vertex"/>
							<OMSTR>1</OMSTR>
							<OMS cd="set1" name="emptyset"/>
						</OMA>
					</OMA>
				</OMA>
			</OMA>
		</OMA>
	</OMA>
</OMOBJ>
</FMP>

</CDDefinition>

</CD>