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The set A={ 0n 1n 2 n | n=1, 2, 3, ......... } is an example of a grammar that is:

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1. 
The pushdown automation M = ({q0, q1, q2 }, {a, b}, {0, 1}, ?, q0 , 0, {q0}) with ? (q0, a, 0) = {q1 , 10} ? (q1, a, 1) = {q1 , 11} ? (q1, b, 1) = {q2 , ?} ? (q2, b, 1) = {q2 , ?} ? (q2, ?, 0) = {q0 , ?} Accepts the language
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