Discussion
The two actions available to a shift reduce parser are
Answer: C
Correct answer: shift, which pushes a token, and reduce, which replaces a right side
Shift moves the next input token onto the stack; reduce pops the symbols of a right side and pushes the corresponding left side. Accept and error are the two remaining table entries, but they terminate the parse rather than advance it. Predict and match belong to top down parsing.
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