GATE Computer Science (CS) 2015 Shift 1 Solved Paper

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Question : 18 of 65

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Which one of the following is TRUE at any valid state in shift-reduce parsing?

Viable prefixes appear only at the bottom of the stack and not inside
Viable prefixes appear only at the top of the stack and not inside
The stack contains only a set of viable prefixes
The stack never contains viable prefixes

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