Shown with a cast-on count of 21 stitches.  

• Row 1 (RS): *[K3, yo, k2tog] twice, repeat from * to last st, k1.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, and 24: Purl.
• Row 3: *[K2, yo, k2tog, k1] twice, repeat from * to last st, k1.
• Row 5: *[K1, yo, k2tog, k2] twice, repeat from * to last st, k1.
• Rows 7, 11, and 15: *[K2tog, yo, k1, yo, k2tog] twice, repeat from * to last st, k1.
• Rows 9, 13, and 17: K1, *[k2tog, yo, k1, yo, k2tog] twice, repeat from *.
• Row 19: K1, *[k2tog, yo, k3] twice, repeat from *.
• Row 21: K1, *[k1, k2tog, yo, k2] twice, repeat from *.
• Row 23: K1, *[k2, k2tog, yo, k1] twice, repeat from *.