Shown with a cast-on count of 17 stitches.  

• Row 1 (RS): K3, yo, k3, k5, k3, yo, k3 (19 sts).
• Row 2: K3, yo, purl to last 3 sts, yo, k3 (21 sts).
• Row 3: K3, yo, k1, sl3 wyib, k1, M1L, sl3 wyib, M1R, k1, sl3 wyib, knit to last 3 sts, yo, k3 (25 sts).
• Row 4: K3, yo, k3, sl3 wyif, k2, sl3 wyif, k2, sl3 wyif, k3, yo, k3 (27 sts).