Shown with a cast-on count of 25 stitches.  

• Row 1 (RS): [K1, ssk, k3, [yo, k1] twice, k2, k2tog] twice, k1.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: Purl.
• Row 3: [K1, ssk, [k2, yo, k1] twice, k1, k2tog] twice, k1.
• Row 5: [K1, ssk, k1, yo, k5, yo, k1, k2tog] twice, k1.
• Row 7: [K1, ssk, yo, k7, yo, k2tog] twice, k1.
• Row 9: Ssk, yo, k9, yo, sl1-k2tog-psso, yo, k9, yo, k2tog.
• Row 11: [K4, k2tog, yo, k1, yo, ssk, k3] twice, k1.
• Row 13: [K3, k2tog, yo, k3, yo, ssk, k2] twice, k1.
• Row 15: [K2, [k2tog, yo] twice, k1, [yo, ssk] twice, k1] twice, k1.
• Row 17: K1, [[k2tog, yo] twice, k3, [yo, ssk] twice, k1] twice.
• Row 19: [K2tog, yo] 3 times, k1, yo, [ssk, yo] twice, sl1-k2tog-psso, yo, [k2tog, yo] twice, k1, [yo, ssk] 3 times.