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#This example uses GraphViz software.
#This example uses Polymake software.
D:=[[1,[2,3]],[2,[3,3]],[3,[4,3],[7,3]],[4,[5,3]],[5,[6,3]]];;
CoxeterDiagramDisplay(D);
C:=CoxeterWythoffComplex(D,[1,2,3,4,5,6,7],4);
R:=FreeGResolution(C,4);;
Print(Homology(TensorWithIntegers(R),3),"\n");
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