gap> V:=ContractibleGcomplex("PSL(4,Z)_d");
Non-free resolution in characteristic 0 for matrix group .
No contracting homotopy available.
gap> R:=FreeGResolution(V,5);
Resolution of length 5 in characteristic 0 for matrix group .
No contracting homotopy available.
gap> Size(R);
[ 18, 210, 1444, 26813 ]
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