Shown with a cast-on count of 30 stitches.  

• Row 1 (RS): Yo, ssk, k4, k2tog, yo, ssk, k2tog, yo, k2, yo, k6, yo, ssk, k8.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, and 40: P30.
• Row 3: K1, yo, ssk, k3, k2tog, yo, k3tog, yo, k3, yo, k7, yo, ssk, k7.
• Row 5: K2tog, yo, ssk, k2, k2tog, yo, k2tog, yo, k4, yo, k8, yo, ssk, k6.
• Row 7: K2tog, yo, ssk, k1, k2tog, yo, k2tog, yo, k5, yo, k9, yo, ssk, k5.
• Row 9: K2tog, yo, ssk, k2tog, yo, k2, yo, k6, yo, ssk, k8, yo, ssk, k4.
• Row 11: K2tog, yo, k3tog, yo, k3, yo, k7, yo, ssk, k8, yo, ssk, k3.
• Row 13: Yo, k2tog, yo, k4, yo, k8, yo, ssk, k6, k2tog, yo, ssk, k2, k2tog.
• Row 15: K2tog, yo, k5, yo, k9, yo, ssk, k5, k2tog, yo, ssk, k1, k2tog, yo.
• Row 17: K1, yo, k6, yo, ssk, k8, yo, ssk, k4, k2tog, yo, ssk, k2tog, yo, k1.
• Row 19: K1, yo, k7, yo, ssk, k8, yo, ssk, k3, k2tog, yo, k3tog, yo, k2.
• Row 21: K1, yo, k8, yo, ssk, k6, k2tog, yo, ssk, k2, k2tog, yo, k2tog, yo, k3.
• Row 23: K1, yo, k9, yo, ssk, k5, k2tog, yo, ssk, k1, k2tog, yo, k2tog, yo, k4.
• Row 25: K2, yo, ssk, k8, yo, ssk, k4, k2tog, yo, ssk, k2tog, yo, k2, yo, k4.
• Row 27: K3, yo, ssk, k8, yo, ssk, k3, k2tog, yo, k3tog, yo, k3, yo, k4.
• Row 29: K4, yo, ssk, k6, k2tog, yo, ssk, k2, k2tog, yo, k2tog, yo, k4, yo, k4.
• Row 31: K5, yo, ssk, k5, k2tog, yo, ssk, k1, k2tog, yo, k2tog, yo, k5, yo, k4.
• Row 33: K6, yo, ssk, k4, k2tog, yo, ssk, k2tog, yo, k2, yo, k6, yo, ssk, k2.
• Row 35: K7, yo, ssk, k3, k2tog, yo, k3tog, yo, k3, yo, k7, yo, ssk, k1.
• Row 37: K6, k2tog, yo, ssk, k2, k2tog, yo, k2tog, yo, k4, yo, k8, yo, ssk.
• Row 39: Ssk, k5, k2tog, yo, ssk, k1, k2tog, yo, k2tog, yo, k5, yo, k9, yo.