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O_o

Well I don't see what it unclear here : "coin" does not support constraint generation. It just doesn't work, the solver does not like it. You cannot solve a LP, add a constraint, and solve it again.

So, because coin does not support constraint generation, there is a flag that lets you say "I want to use constraint generation, so only give me solvers that support it". If you set this to True, then Coin will never be returned, given that it does not support constraint generation.

O_o

What is wrong with that ?