LogTo("d:/gap/games/topspin/topspin1.log");

r:=(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20);
f:=(1,4)(2,3);
G:=Group(r,f);;

Size(G);

g1:=(1,2) in G;

Read("d:/gap/gap3r4p3/lib/abstab.g");

g2:=FactorPermGroupElement(G,g1);