4. The ordered pair (1, 1) belongs to the relations R1, R3, R4 and R6.
The ordered pair (1, 2) belongs to the relations R1 and R6.
The ordered pair (2, 1) belongs to the relations R2, R5 and R6.
The ordered pair (1, -1) belongs to the relations R2, R3 and R6.
The ordered pair (2, 2) belongs to the relations R1, R3 and R4.