
ord_subtract(+Set1, +Set2, -Difference)

   Subtracts Set2 from Set1

Arguments
   Set1                A set
   Set2                A set
   Difference          A set or variable

Type
   library(ordset)

Description
	Succeeds when Difference contains all and only the elements
	of Set1 which are not also in Set2.
    

Modes and Determinism
   ord_subtract(+, +, -) is det

See Also
   ord_symdiff / 3
