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The transition a Push down automaton makes is additionally dependent upon the:

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A PDA machine configuration (p, w, y) can be correctly represented as:
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Define for a context free language L ? {0, 1}* ,  init(L)={u ? uv ? L for some v in {0,1}?} ( in other words, init(L) is the set of prefixes of L) Let L = {w ? w is nonempty and has an equal number of 0
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