R1 C1	R1 C2	R1 C3	R1 C4
R2 C1	R2 C2	R2 C3	R2 C4
R3 C1	R3 C2	R3 C3	R3 C4
R4 C1	R4 C2	R4 C3	R4 C4
R5 C1	R5 C2	R5 C3	R5 C4