gap> G:=SpaceGroupIT(3,227);;
gap> R:=ResolutionSpaceGroup(G,11);
Resolution of length 11 in characteristic 0 for &lt;matrix group with 
8 generators&gt; . 
No contracting homotopy available. 

gap> Size(R);
[ 38, 246, 456, 644, 980, 1427, 2141, 2957, 3993, 4911, 6179 ]
