Shown with a cast-on count of 13 stitches.  

• Row 1 (RS): K5, yo, k1, yo, k3, MB, k1, k2tog (14 sts).
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: P2tog, p12 (13 sts).
• Row 3: K4, yo, k1, yo, k6, k2tog (14 sts).
• Row 5: K3, yo, k1, yo, k7, k2tog (14 sts).
• Row 7: K2, yo, k1, yo, k8, k2tog (14 sts).
• Row 9: [K1, yo] twice, k9, k2tog (14 sts).
• Row 11: Ssk, k1, MB, k3, yo, k1, yo, k5 (14 sts).
• Row 13: Ssk, k6, yo, k1, yo, k4 (14 sts).
• Row 15: Ssk, k7, yo, k1, yo, k3 (14 sts).
• Row 17: Ssk, k8, yo, k1, yo, k2 (14 sts).
• Row 19: Ssk, k9, [yo, k1] twice (14 sts).