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Next round of DB discussion

OK. Object - Object relationships. They are all many-to-many.

I.E. topic contains multiple problems. Yet problem can be used in
different topics
(i.e. in different courses). Same applies to Explanations,
topic-to-course, and
dialog-of-texts objects.

I don't remember about others.
Ah, yes, tests. (We need to add them - they are just collection of
problems, with extra
info related to how to pass them, etc - see model layer class diagram).

Ilya A. Volynets-Evenbakh
Total Knowledge. CTO

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