p0:= PermList([2, 1, 4, 5, 3, 7, 6]);
p1:= PermList([3, 1, 2, 6, 7, 4, 5]);
p2:= PermList([1, 3, 5, 2, 6, 4, 7]);
H:=Group(p0,p1,p2);