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get_regret_upb(?Var, -Regret)
Returns the regret value for the upper bound of Var.
- Var
- A domain variable
- Regret
- Regret value
Description
   Returns the regret value for the upper bound of the variable, that is, 
   the magnitude of the difference between the largest and second largest 
   value in the variable's domain. This can be used in selecting a variable 
   for labelling.
Modes and Determinism
- get_regret_upb(?, -) is det