Shown with a cast-on count of 23 stitches.  

• Rows 1 and 3 (RS): P2, p6, k2tog, yo, k3, yo, ssk, p6, p2.
• Row 2: P2, k6, p7, k6, p2.
• Row 4: P2, k5, ssp, yo, p2, pfb, p2, yo, p2tog, k5, p2 (24 sts).
• Row 5: P2, p4, k2tog, yo, k4, yo, k4, yo, ssk, p4, p2 (25 sts).
• Row 6: P2, k3, ssp, p3, ssp, yo, p1, yo, p2tog, p3, p2tog, k3, p2 (23 sts).
• Row 7: P2, p2, k2tog, yo, k2, k2tog, yo, k3, yo, ssk, k2, yo, ssk, p2, p2.
• Row 8: P2, k2, p3, ssp, yo, p5, yo, p2tog, p3, k2, p2.
• Row 9: P2, p2, ssk, yo, k2tog, yo, k2, k3, k2, yo, ssk, yo, k2tog, p2, p2.
• Rows 10, 16, and 22: P2, k2, p1, ssp, yo, p2, yo, p2tog, p1, ssp, yo, p2, yo, k2tog, p1, k2, p2.
• Rows 11, 17, and 23: P2, p2, ssk, yo, k11, yo, k2tog, p2, p2.
• Rows 12, 18, and 24: P2, k2, p2, p4, yo, p3tog, yo, p4, p2, k2, p2.
• Rows 13, 19, and 25: P2, p2, ssk, yo, k2tog, k2, yo, k3, yo, k2, ssk, yo, k2tog, p2, p2.
• Rows 14, 20, and 26: P2, k2, p2, ssp, p1, yo, p1, ssp, yo, p2, yo, p1, p2tog, p2, k2, p2.
• Rows 15 and 21: P2, p2, ssk, yo, k2tog, yo, k2, k2, k1, k2, yo, ssk, yo, k2tog, p2, p2.
• Row 27: P2, p2, ssk, yo, k2tog, yo, ssk, yo, k3, yo, k2tog, yo, ssk, yo, k2tog, p2, p2.
• Row 28: P2, k2, p1, ssp, yo, p3, p3tog, p3, yo, p2tog, p1, k2, p2 (21 sts).
• Rows 29, 31, 33, 35, 37, and 39: P2, p2, [ssk, yo] 3 times, k1, [yo, k2tog] 3 times, p2, p2.
• Rows 30, 32, 34, 36, and 38: P2, k2, p13, k2, p2.
• Row 40: Yo, p2, k2, p13, k2, p2 (22 sts).