Method ADT.Relation.Binary()->add()
- Method
add
 this_program(<LeftType,RightType>) add(LeftTypeleft,RightTyperight)- Description
 Adds "
leftRright" as a member of the relation. Returns the same relation.
this_program(< LeftType, RightType >) add(LeftType left, RightType right)
Adds "left R right" as a member of the relation. Returns
 the same relation.