Shown with a cast-on count of 30 stitches.  

• Row 1 (RS): K5, *k3, k2tog, yo, ssk, k3, repeat from * to last 5 sts, k5 (multiple of 9 sts, plus 10).
• Row 2: P5, *p4, (k1, p1) in next st, p4, repeat from * to last 5 sts, p5 (multiple of 10 sts, plus 10).
• Row 3: K5, *k1, incL, [k2tog, yo, ssk] twice, incR, k1, repeat from * to last 5 sts, k5.
• Rows 4, 8, and 10: Purl.
• Row 5: K3, k2tog, yo, *[ssk] twice, yo, 1/1 RC, yo, [k2tog] twice, yo, repeat from * to last 5 sts, ssk, k3 (multiple of 9 sts, plus 9).
• Row 6: P4, *(k1, p1) in next st, p8, repeat from * to last 5 sts, (k1, p1) in next st, p4 (multiple of 10 sts, plus 10).
• Row 7: K1, incL, k2tog, yo, ssk, *k2tog, yo, ssk, incR, k2, incL, k2tog, yo, ssk, repeat from * to last 5 sts, k2tog, yo, ssk, incR, k1.
• Row 9: K2, ssk, yo, 1/1 RC, *yo, k2tog, k4, ssk, yo, 1/1 RC, repeat from * to last 4 sts, yo, k2tog, k2.