...object.

Actually, all objects of a class share the class methods, while they have individual copies of the class's member variables.

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...variables

Programmers of object-oriented languages distinguish between an ``is a'' and a ``has a'' relationship: only if an object is a variation of the other object, should a programmer use inheritance. For a ``has a'' relationship a programmer should make make an object of one class a member variable of the other. If in doubt, the authors tend to prefer a ``has a'' relationship in non-abstract classes.

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...type

as I pointed out above some solvers accept only certain operators

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...Challenge

We have not yet seriously attempted to port the HCL package.

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