(C2 x C2 x C2 x C2 x C2 x C2) : C2
r0 := (1,2)(3,5)(4,7)(6,10)(8,13)(9,12)(11,14)(15,16);
r1 := (1,3)(2,4)(5,9)(6,11)(7,12)(8,14)(10,15)(13,16);
r2 := (3,4)(5,7)(6,8)(10,13);
r3 := (3,6)(4,8)(5,10)(7,13);
F := FreeGroup(4);
r0 := F.1;; r1 := F.2;; r2 := F.3;; r3 := F.4;;
G := F/[ r2^2, r3^2, r0^2, r1^2, (r0*r3)^2, (r0*r2)^2, (r2*r3)^2, (r3*r1*r2*r1)^2, (r2*r1)^4, (r1*r3)^4, (r1*r0*r1*r3)^2, (r0*r1)^4, (r1*r2*r1*r0)^2 ];;
type 0: 4 elements
type 1: 16 elements
type 2: 4 elements
type 3: 4 elements