Is there such a definition for A such that A is defined A=>B. Hence nowhere in the definition does it say anything will imply A.(adsbygoogle = window.adsbygoogle || []).push({});

Is there such a definition for D such that D is defined C=>D. Hence nowhere in the definition does it specify what D implies.

If there exist definitions of A and D then please give examples. If not, why not?

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# Use of definitions

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