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Bool is the logical negation of BoolExpr.
- 0/1-valued expression, such as reified constraint
- Truth value of the negation
Equivalent to B #= BoolExpr, Bool #= 1-B.
If BoolExpr is a constraint that has a corresponding reified form,
Bool is the logical negation of its truth value.
and / 2, and / 3, neg / 1, or / 2, or / 3, => / 2, => / 3