CO 16 STS
Row 1: K1, P1 *YO, K1, P1*
Row 2, 4, 6, 8, 10: *K1, P2TOG, YO* K1, P1
Row 3, 5, 7, 9: K1, P1 *YO, K2TOG, P1*
Row 11, 13, 15, 17, 19: K1, P1 *S1PW, K1, PSSO, YO, P1*
Row 12, 14, 16, 18, 20: *K1, YO, P2TOG TBL* K1, P1
Row 21: K1, P1 *YO, S1PW, K1, PSSO, P1*
Repeat rows 2-21 until desired length