Ullman (Compiler Design) Edition 2 Exercise 2.2 Question 4 (Page No. 51 - 52)

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Construct unambiguous context-free grammars for each of the following languages. In each case show that your grammar is correct.

Arithmetic expressions in postfix notation.
Left-associative lists of identifiers separated by commas.
Right-associative lists of identifiers separated by commas.
Arithmetic expressions of integers and identifiers with the four binary operators $+, -, *, /$.
Add unary plus and minus to the arithmetic operators of $(d)$.

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