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# set_labeling(++UpDown, +SetVars)

Label set variables
*UpDown*
- Atom: 'up' or 'down'.
*SetVars*
- List of set variables.

## Description

Instantiate all variables in SetVars from first to last, with
consecutive refinements of their domains until they are ground.
If heuristic UpDown is 'up' then, for each set variable, for each element
in its poss (lub\glb), inclusion is tried first; otherwise (down)
exclusion is tried first.

### Fail Conditions

Fails if SetVars can not be labeled (there is no solution to the CSP).
### Resatisfiable

Yes.
## Examples

?- S `:: [a] + [b, c], T `:: [1] + [2], set_labeling(up, [S, T]).
S = [a, b, c], T = [1, 2] ;
S = [a, b, c], T = [1] ;
S = [a, b], T = [1, 2] ;
S = [a, b], T = [1] ;
S = [a, c], T = [1, 2] ;
S = [a, c], T = [1] ;
S = [a], T = [1, 2] ;
S = [a], T = [1] ;
no
?- S `:: [a] + [b, c], T `:: [1] + [2], set_labeling(down, [S, T]).
S = [a], T = [1] ;
S = [a], T = [1, 2] ;
S = [a, c], T = [1] ;
S = [a, c], T = [1, 2] ;
S = [a, b], T = [1] ;
S = [a, b], T = [1, 2] ;
S = [a, b, c], T = [1] ;
S = [a, b, c], T = [1, 2] ;
no

## See Also

set_labeling / 1, refine / 2