Shown with a cast-on count of 7 stitches.  

• Row 1 (RS): K2, [yo, k1] twice, yo, k1, yo, k2 (11 sts).
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: K2, purl to last 2 sts, k2.
• Row 3: K2, [yo, k3, yo, k1] twice, k1 (15 sts).
• Row 5: K2, [yo, k5, yo, k1] twice, k1 (19 sts).
• Row 7: K2, *yo, k1, yo, ssk, k1, k2tog, [yo, k1] twice, repeat from * to last st, k1 (23 sts).
• Row 9: K2, *yo, k3, yo, sl1-k2tog-psso, yo, k3, yo, k1, repeat from * to last st, k1 (27 sts).
• Row 11: K2, *yo, k3, k2tog, yo, k1, yo, ssk, k3, yo, k1, repeat from * to last st, k1 (31 sts).
• Row 13: K2, *yo, k1, yo, ssk, k1, k2tog, yo, k1, repeat from * to last st, k1 (35 sts).
• Row 15: K2, *[yo, k3, yo, sl1-k2tog-psso] twice, yo, k3, yo, k1, repeat from * to last st, k1 (39 sts).
• Row 17: K2, *yo, k3, [k2tog, yo, k1, yo, ssk, k1] twice, k2, yo, k1, repeat from * to last st, k1 (43 sts).
• Row 19: K2, *yo, k1, yo, ssk, k1, [k2tog, yo, k1, yo, ssk, k1] twice, k2tog, [yo, k1] twice, repeat from * to last st, k1 (47 sts).