Cho A ={11, 12, 13, 14, 15}. Quan hệ R được xác định: . Quan hệ R được biểu diễn là:

{(11, 11), (12, 12), (13, 13), (14, 14), (11, 13), (13, 11), (11, 15), (15, 11), (12, 14), (14, 12)}

{(11, 11), (12, 12), (13, 13), (14, 14), (15, 15), (11, 13), (11, 15), (13, 15), (12, 14)}

{(11, 13), (13, 11), (11, 15), (15, 11), (13, 15), (15, 13), (12, 14), (14, 12)}

{(11,11), (12, 12), (13, 13), (14, 14), (15, 15), (11,13), (13, 11), (11, 15), (15, 11), (13, 15), (15, 13), (12, 14), (14, 12)}