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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