Shown with a cast-on count of 40 stitches.  

• Row 1 (RS): Sl1 wyib, yo, [k1, p1] 19 times, k1 (41 sts).
• Rows 2, 4, 6, 8, and 10: Sl1 wyib, yo, *k1, p1, repeat from * to last 2 sts, k2tog.
• Rows 3, 5, 7, and 9: Sl1 wyib, yo, *k1, p1, repeat from * to last 2 sts, k2tog.
• Row 11: Sl1 wyib, yo, p3, k1, M1L, k2, M1R, k1, p2, [k1, p1] 4 times, k1, M1L, k2, M1R, [k1, p1] 5 times, p1, k1, M1L, k2, M1R, k1, p3, k2tog (47 sts).
• Row 12: Sl1 wyib, yo, k3, p6, k2, p3, [k1, p1] 3 times, p5, [k1, p1] 3 times, p2, k2, p6, k3, k2tog.
• Row 13: Sl1 wyib, yo, p3, k6, p2, k1, p1, k1, [k1, p1] twice, k1, 2/1 RPC, 2/1 LPC, [k1, p1] twice, k2, p1, k1, p2, k6, p3, k2tog.
• Row 14: Sl1 wyib, yo, k3, p6, k2, p3, [p1, k1] twice, p3, k2, p3, [k1, p1] twice, p3, k2, p6, k3, k2tog.
• Row 15: Sl1 wyib, yo, p3, 3/3 RC, p2, k1, p1, k1, [p1, k1] twice, 2/1 RPC, p2, 2/1 LPC, [k1, p1] twice, k1, p1, k1, p2, 3/3 LC, p3, k2tog.