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In the CFG - > PDA conversion we maintained the invariant that Choice 1 of 4 : the input concatenated with the stack contents is
In the CFGPDA conversion we maintained the invariant that Choice of : the input concatenated with the stack contents is a derivation string Choice of : the stack contains a derivation string Choice of : the input read so far is a derivation string Choice of : the input read so far concatenated with the stack contents is a derivation string As a reminder, a derivation string is any one of the strings in the intermediate steps of a derivation Sw including S and w
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