Shown with a cast-on count of 41 stitches.  

• Rows 1, 3, 5, 7, 9, 15, 17, 19, and 21 (WS): Purl.
• Row 2: K2, *yo, k2, ssk, k3, k2tog, k2, yo, k2, repeat from *.
• Row 4: K3, *yo, k2, ssk, k1, k2tog, k2, yo, k4, repeat from * to last 12 sts, yo, k2, ssk, k1, k2tog, k2, yo, k3.
• Row 6: K4, *yo, k2, sl1-k2tog-psso, k2, yo, k6, repeat from * to last 11 sts, yo, k2, sl1-k2tog-psso, k2, yo, k4.
• Row 8: K5, *yo, k2, sl1-k2tog-psso, yo, k2, k2tog, yo, k4, repeat from * to last 10 sts, yo, k2, sl1-k2tog-psso, yo, k2, k2tog, yo, k1.
• Row 10: K4, *k2tog, [yo] twice, k2, ssk, k1, k2tog, [yo] twice, ssk, k2, repeat from * to last 11 sts, k2tog, [yo] twice, k2, ssk, k1, k2tog, [yo] twice, ssk.
• Row 11: P1, k1, p6, k1, p2, *p3, k1, p6, k1, p2, repeat from * to last 4 sts, p4.
• Row 12: K3, *k2tog, k2, [yo] twice, k2, ssk, k5, repeat from * to last 12 sts, k2tog, k2, [yo] twice, k2, ssk, k4.
• Row 13: P7, k1, p3, *p9, k1, p3, repeat from * to last 4 sts, p4.
• Row 14: K2, *k2tog, k2, [yo, k2] twice, ssk, k3, repeat from *.
• Row 16: K1, *k2tog, k2, yo, k4, yo, k2, ssk, k1, repeat from * to last st, k1.
• Row 18: K2tog, *k2, yo, k6, yo, k2, k3tog, repeat from * to last 13 sts, k2, yo, k6, yo, k2, k2tog, k1.
• Row 20: K7, *yo, ssk, k2, yo, k3tog, k2, yo, k4, repeat from * to last 8 sts, yo, ssk, k2, yo, k2tog, k2.
• Row 22: K6, *k2tog, [yo] twice, ssk, k1, k2tog, k2, [yo] twice, ssk, k2, repeat from * to last 9 sts, k2tog, [yo] twice, ssk, k5.
• Row 23: P7, k1, p1, *p3, k1, p6, k1, p2, repeat from * to last 6 sts, p6.
• Row 24: K1, yo, *k2, ssk, k5, k2tog, k2, [yo] twice, repeat from * to last 14 sts, k2, ssk, k5, k2tog, k2, yo, k1.
• Row 25: P13, *k1, p12, repeat from * to last 2 sts, p2.