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Why are only concrete data types capable of implementing abstract data types?

Why does Mark Allen Weiss only implement or say that abstract data types must/should be implemented by concrete data types in Data Structures and Algorithm Analysis in Java (3rd edition), section 3.1 Abstract Data Types, page 57? I thought you could implement an abstract data type with another abstract data type as said in this blog; why do it with a concrete data type specifically?

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