Question: Define G ( s ) : = s | | s where | | denotes concatenation. Describe and analyze an attack showing that G is

Define G(s):= s||s where || denotes concatenation. Describe and analyze an attack showing that G is not a pseudorandom generator.
Let G be a pseudorandom generator. In each of the following cases, say whether G is necessarily a pseudorandom generator. If yes, give a proof; if not, show a counterexample.

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