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

Which one of the following is true at any valid state in shift-reduce parsing? Correct Answer Stack contains only viable prefixes

The prefixes on the stack of a shift-reduce parser are called viable prefixes.

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1. All valid arguments have only true premises.
2. A sound argument must be valid.
3. An argument with a false conclusion can't be valid.
4. All arguments with true conclusion are valid.
Which of the following statements is/are correct?
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4. All arguments with true conclusion are valid.
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2. The Supreme Court has original jurisdiction in any dispute between the Government of India and any State or States on one side and one or more other State on the other.
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Which of these statements are correct?
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