gap> G:=SpaceGroupIT(3,227);;
gap> R:=ResolutionSpaceGroup(G,11);
Resolution of length 11 in characteristic 2 for &lt;matrix group with 
8 generators&gt; . 
No contracting homotopy available.

gap> Size(R);
[ 26, 240, 531, 668, 1016, 1550, 2319, 3169, 4219, 5217, 6833 ]
