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  3. 2 double points let be a finite alphabet if x...

Question: 2 double points let be a finite alphabet if x...

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2. Double points. Let be a finite alphabet. If x, y є . then it is possible that xy-yr, for instance when y-E. What if we also require that neither 1 nor y s equal to €. Either prove that this cannot happen, or describe precisely the conditions under which it always happens.

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