S1, R2

S1, R3

S1, R3

S1, R4

S1, R4

S2, R1

S2, R1

S2, R2

S2, R2

S2, R4

S2, R4

S2, R6

S3, R1

S3, R1

S3, R4

S3, R4

S3, R5

S3, R5