p0:= PermList([4, 1, 3, 6, 5, 2, 7, 8]);
p1:= PermList([5, 3, 1, 8, 2, 7, 4, 6]);
p2:= PermList([3, 6, 5, 1, 2, 8, 4, 7]);
H:=Group(p0,p1,p2);