Let a be a nonidentity element of G. We consider the group H generated by single element a.
H=<a>. Clearly all elements of H must belong to G. Therefore H becomes a subgroup of G.
But as a"\\neq e", H"\\neq \\{e\\}" . Therefore H=<a>=G. (as the only subgroups of G are "\\{e\\}, G)"
Hence G becomes cyclic.
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