Gapplet

Specify a subgroup H of Sn by a set of generators; then we verify if H is a normal subgroup of Sn.

Input a sequence of permutations in Sn, e.g., 
  (1,2)(3,4), (1,3)(2,4) when n = 4.
 
Determine normality of the subgroup generated by the permutations given.