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0. Which of the following grammar rules violate the requirements of an operator grammar? P, Q, R are not terminals and r, s, t are terminals. (i) P → Q R (ii) P → Q s R (iii) P → ε (iv) P → Q t R r
(i) only
(i) and (iii) only
(ii) and (iii) only
(iii) and (iv) only
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