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2N→2N→2N N.→N.→N N.→2N→N 2N→N.→2N
2n→2n→2n n→n→n n→2n→2n 2n→n→2n
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2n →2n→2n n →n→n n →2n→n 2n →n→2n
2n→2n→2n n→n→n n→2n→n 2n→n→2n
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2N 2N 2N N N N N 2N N 2N N 2N