Shown with a cast-on count of 18 stitches.  

• Rows 1 and 21 (RS): [K1, yo] 3 times, ssk, yo, k2, sl2-k1-p2sso, k2, yo, [sl2-k1-p2sso, yo] twice.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, and 22: P18.
• Row 3: K2, [yo, k1] twice, k1, yo, sl2-k1-p2sso, yo, k1, sl2-k1-p2sso, k1, yo, sl2-k1-p2sso, yo, ssk, yo.
• Row 5: K2, sl2-k1-p2sso, k2, yo, [sl2-k1-p2sso, yo] twice, [k1, yo] 3 times, ssk, yo.
• Row 7: K1, sl2-k1-p2sso, k1, yo, sl2-k1-p2sso, yo, ssk, yo, k2, [yo, k1] twice, k1, yo, sl2-k1-p2sso, yo.
• Row 9: Sl2-k1-p2sso, yo, [k1, yo] 3 times, ssk, yo, k2, sl2-k1-p2sso, k2, yo, sl2-k1-p2sso, yo.
• Row 11: Ssk, yo, k2, [yo, k1] twice, k1, yo, sl2-k1-p2sso, yo, k1, sl2-k1-p2sso, k1, yo, sl2-k1-p2sso, yo.
• Row 13: Yo, ssk, yo, k2, sl2-k1-p2sso, k2, [yo, sl2-k1-p2sso] twice, [yo, k1] 3 times.
• Row 15: Yo, sl2-k1-p2sso, yo, k1, sl2-k1-p2sso, k1, yo, sl2-k1-p2sso, yo, ssk, yo, k2, [yo, k1] twice, k1.
• Row 17: Yo, [sl2-k1-p2sso, yo] twice, [k1, yo] 3 times, ssk, yo, k2, sl2-k1-p2sso, k2.
• Row 19: Yo, sl2-k1-p2sso, yo, ssk, yo, k2, [yo, k1] twice, k1, yo, sl2-k1-p2sso, yo, k1, sl2-k1-p2sso, k1.