Shown with a cast-on count of 19 stitches.  

• Row 1 (WS): Knit.
• Row 2: K1, [yo, yo, k2tog] 8 times, kfb, k1 (28 sts).
• Row 3: K1, kfb, k1, [k2, p1] 8 times, k1 (29 sts).
• Row 4: K25, ssk, kfb, k1.
• Row 5: K1, kfb, knit (30 sts).
• Rows 6, 8, 10, 12, 16, 18, 20, 22, and 24: K25, ssk, knit to last 2 sts, kfb, k1.
• Row 7: K1, kfb, knit (31 sts).
• Row 9: K1, kfb, knit (32 sts).
• Row 11: K1, kfb, knit (33 sts).
• Row 13: K1, kfb, knit (34 sts).
• Rows 14 and 26: BO 8 sts, [yo, yo, k2tog] 8 times, ssk, *yo, k2tog, repeat from * to last 3 sts, k1, kfb, k1.
• Row 15: K1, kfb, knit to last 25 sts, [k2, p1] 8 times, k1 (1 more st).
• Rows 17, 19, 21, 23, and 25: K1, kfb, knit (1 more st).
• Repeat rows 15-26.