gap> G:=SpaceGroup(4,122);;
gap> R:=ResolutionCubicalCrystGroup(G,20);
Resolution of length 20 in characteristic 0 for &lt;matrix group with 
6 generators&gt; . 

gap> Size(R);
[ 8, 24, 24, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
