Shown with a cast-on count of 18 stitches.  

• Row 1 (RS): *K1, yo, k2, yo, ssk, k2tog, k1, yo, repeat from * to last 2 sts, k2 (multiple of 9 sts, plus 2).
• Rows 2, 4, 6, 8, 10, and 12: Purl.
• Row 3: *K2, yo, k2, ssk, k2tog, k1, yo, repeat from * to last 2 sts, k2.
• Row 5: *K3, yo, k1, ssk, k2tog, k1, yo, repeat from * to last 2 sts, k2.
• Row 7: *K4, yo, ssk, k2tog, k1, yo, repeat from * to last 2 sts, k2.
• Row 9: *K2, yo, k2, yo, ssk, k2tog, k1, yo, repeat from * to last 2 sts, k2 (multiple of 10 sts, plus 2).
• Row 11: *K5, ssk, k2tog, k1, repeat from * to last 2 sts, k2 (multiple of 8 sts, plus 2).