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No, now I re-explain, I hope better.

First, I said getStatementsCount just for example, but the method name is absolutely up to you.

getStatementsCount() should be an abstract method in Stm....

Reading the code, I can have a good/valid idea of what that code should "express". In other words, I understand what you would like to do in general.
But the fact is that you must have a clear...