CO 15 STS
Rows 1 & 3: K5 *K2TOG, YO, K1, YO, S1KW, K1, PSSO, K5*
Rows 2 & 4: *P7, S1PW, P2* P5
Rows 5 & 11: *K*
Rows 6 & 12: *P*
Rows 7 & 9: *K2TOG, YO, K1, YO, S1KW, K1, PSSO, K5* K2TOG, YO, K1, YO, S1KW, K1, PSSO
Rows 8 & 10: *P2, S1PW, P7* P2, S1PW, P2
Repeat rows 1-10, until desired length.