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i am getting option A and C are correct.

in C option after f  we will back to f->g->d and then d->b->a

therefore option C is right and remaining options B and D are incorrect because c can not occur just after d and d can not occur just after c respectively.
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2) c cant occur just after d
4) d cant occur just after c
i think 1 nd 3 r correct

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