Question: Construct Pushdown Automata for the following context - free languages over the alphabet Sigma = { a , b } . a )

Construct Pushdown Automata for the following context-free languages over the alphabet Sigma =\{a, b\}.
a) L(M)=\ a ^ n * b * b ^(2n)|n in mathbb Z ^ n>=0\
b) L(M)= L(G), G =(\{S, A\},\{a, b\}, R, S), R =\{S -> e, S -> abS, S->A,A->b\}

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