Hi all,
I'm trying to express a constraint using a data structure.
Let's say I'd want to express a "mapping" of a to b, c to b, d to b and
e to f.
A mapping can also be from a to a, b to b and so on.
The constraint is that one cannot map a to b if b was already "mapped"
to let's say c.
I'd like to express this constraint in a data structure, but haven't
figured out how, yet.
Any suggestions?
Günther
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