Nonisomorphic central extensions

Describe all nonisomorphic central extensions of Z_2 x Z_2 by a cyclic group Z_n for arbitrary n, meaning central extensions of the form: 1 --> Z_n --> G --> Z_2 x Z_2 --> 1

Automorphism Group of Z_p + Z_{p^2}

Automorphism Group of Z_p + Z_{p^2}

Extension of A_5

Extension of A_5

Conjugated Classes of Subgroups of A_5

Conjugated Classes of Subgroups of A_5

S_5 = Aut(A_5)

S_5 = Aut(A_5)