/*
www-ATLAS of Group Representations.
21.M20 represented as permutations on 12 points.
*/

G<x,y>:=PermutationGroup<12|\[
2,1,5,7,3,8,6,4,12,9,10,11]
,\[
3,5,4,1,6,2,9,11,10,7,12,8]
>;
print "Group G is 21.M20 < Sym(12)";