gap> f1:=(1,6)(2,5)(3,4);
(1,6)(2,5)(3,4)
gap> f2:=(2,7)(2,6)(4,5);
Error, Perm: cycles must be disjoint
gap> f2:=(2,7)(3,6)(4,5);
(2,7)(3,6)(4,5)
gap> f3:=(3,8)(4,7)(5,6);
(3,8)(4,7)(5,6)
gap> f4:=(4,9)(5,8)(6,7);
(4,9)(5,8)(6,7)
gap> f5:=(5,10)(6,9)(7,8);
( 5,10)( 6, 9)( 7, 8)
gap> f6:=(6,11)(7,10)(8,9);
( 6,11)( 7,10)( 8, 9)
gap> (f1*f2*f3*f4*f5*f6)^2;
( 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11)
gap> r:=(12,11,10,9,8,7,6,5,4,3,2,1);
( 1,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2)
gap> r*(f1*f2*f3*f4*f5*f6)^2;
( 1,12)
gap> quit;