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In case of Bottom up evaluation,All Semantic Rule should keep on RHS of the Production Rule...

Thus Marker Nonterminals can be Inserted in place of {} - Semantic Rule

And Filnally put Marker Nonterminals --> epsolon....

Other Use is in copy rule...But I Can's Understand that...Sorry :)

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15y ago

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Q: What are marker non-terminal symbol?
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