
?Element in ?SetVariable

   Set membership constraint

Arguments
   SetVariable         A set variable.
   Element             A ground term or a variable.

Type
   library(cardinal)

Description
Constrain SetVariable to include Element.
		in/2 is available for compatibility with conjunto library syntax.
		It is equivalent to the preferred `@/2. See its description for details.

Fail Conditions
   Fails if Element can not be a member of SetVariable.

Resatisfiable
   No.

See Also
   `@ / 2, `-@ / 2, notin / 2, `:: / 2
