Question: Find a structure B and a substructure AC B such that A B but A K B. In partic- ular, A is a substructure

Find a structure B and a substructure AC B such that A 

Find a structure B and a substructure AC B such that A B but A K B. In partic- ular, A is a substructure of B that is elementary equivalent to B but is not an elementary substructure of B.

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