Shown with a cast-on count of 73 stitches.  

• Row 1 (RS): K1, *yo, p4, ssk, k11, k2tog, p4, yo, k1, repeat from *.
• Rows 2 and 28: *P2, k4, p13, k4, p1, repeat from * to last st, p1.
• Row 3: K1, *yo, k1, p4, ssk, k9, k2tog, p4, k1, yo, k1, repeat from *.
• Rows 4 and 26: *P3, k4, p11, k4, p2, repeat from * to last st, p1.
• Row 5: K1, *yo, k2, p4, ssk, k7, k2tog, p4, k2, yo, k1, repeat from *.
• Rows 6 and 24: *P4, k4, p9, k4, p3, repeat from * to last st, p1.
• Row 7: K1, *yo, k3, p4, ssk, k5, k2tog, p4, k3, yo, k1, repeat from *.
• Rows 8 and 22: *P5, k4, p7, k4, p4, repeat from * to last st, p1.
• Row 9: K1, *yo, k4, p4, ssk, k3, k2tog, p4, k4, yo, k1, repeat from *.
• Rows 10 and 20: *P6, [k4, p5] twice, repeat from * to last st, p1.
• Row 11: K1, *yo, k5, p4, ssk, k1, k2tog, p4, k5, yo, k1, repeat from *.
• Rows 12 and 18: *P7, k4, p3, k4, p6, repeat from * to last st, p1.
• Row 13: K1, *yo, k6, p4, sl1-k2tog-psso, p4, k6, yo, k1, repeat from *.
• Rows 14 and 16: *P8, k4, p1, k4, p7, repeat from * to last st, p1.
• Row 15: K1, *k7, p4, k1, p4, k8, repeat from *.
• Row 17: K1, *k5, k2tog, p4, yo, k1, yo, p4, ssk, k6, repeat from *.
• Row 19: K1, *k4, k2tog, p4, [k1, yo] twice, k1, p4, ssk, k5, repeat from *.
• Row 21: K1, *k3, k2tog, p4, k2, yo, k1, yo, k2, p4, ssk, k4, repeat from *.
• Row 23: K1, *k2, k2tog, p4, k3, yo, k1, yo, k3, p4, ssk, k3, repeat from *.
• Row 25: K1, *k1, k2tog, p4, k4, yo, k1, yo, k4, p4, ssk, k2, repeat from *.
• Row 27: K1, *k2tog, p4, k5, yo, k1, yo, k5, p4, ssk, k1, repeat from *.
• Row 29: K2tog, p4, k6, yo, k1, *yo, k6, p4, sl1-k2tog-psso, p4, k6, yo, k1, repeat from * to last 12 sts, yo, k6, p4, ssk.
• Rows 30 and 32: *P1, k4, p15, k4, repeat from * to last st, p1.
• Row 31: K1, *p4, k15, p4, k1, repeat from *.
• Repeat rows 1-32.