G:=SylowSubgroup(SymmetricGroup(8),2);;
C:=CrossedModuleByAutomorphismGroup(G);;
Pi_1:=HomotopyGroup(C,1);;
Pi_2:=HomotopyGroup(C,2);;
Print(StructureDescription(Pi_1),"\n");
Print(StructureDescription(Pi_2),"\n");
