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Conceptual schema

A Conceptual schema is a map of concepts and their releationships.

incomplete list of concepts:

physical object (an instance of something)
abstraction (a class of something)

incomplete list of relationships:

A is a[?] B
A contains[?] B
A requires[?] B

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Coronary circulation

... arteries requires cardiac catheterization[?]. In general there are two main coronary arteries, the Left and Right. The left coronary artery (LCA) arises from the ...