/*
www-ATLAS of Group Representations.
A21 represented as permutations on 21 points.
*/

G<x,y>:=PermutationGroup<21|\[
2,3,1,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]
,\[
1,2,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,3]
>;
print "Group G is A21 < Sym(21)";