Question: Construct a Pushdown Automata (PDA) for the following language: ? L = {w ? {a, b}? | (w = w^R) and number of as =

Construct a Pushdown Automata (PDA) for the following language:

? L = {w ? {a, b}? | (w = w^R) and number of as = number of bs}

? L = {w ? {a, b}? | w has twice as many as as bs}

? L = {a^i b^j c^k | i?j or j?k}

? L = {w ? {a, b}? | number of as < number of bs}

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