SET RELATION FUNCTION-1
SET RELATION FUNCTION-2
SET RELATION FUNCTION-3
SET RELATION FUNCTION-4
PROPOSITIONAL LOGIC 1
PROPOSITIONAL LOGIC 2
PROPOSITIONAL LOGIC 3
PROPOSITIONAL LOGIC 4
PROPOSITIONAL LOGIC 5
PROPOSITIONAL LOGIC 6
PROPOSITIONAL LOGIC 7
PROPOSITIONAL LOGIC 8