Shown with a cast-on count of 38 stitches.  

• Row 1 (RS): K4, *k13, k4, repeat from *.
• Row 2: *P4, 1/1 RPC, p9, 1/1 LPC, repeat from * to last 4 sts, p4.
• Row 3: K4, *p1, ssk, k7, k2tog, p1, k4, repeat from * (multiple of 15 sts, plus 4).
• Row 4: *P4, k1, 1/1 RPC, p5, 1/1 LPC, k1, repeat from * to last 4 sts, p4.
• Row 5: K4, *p2, ssk, k3, k2tog, p2, k4, repeat from * (multiple of 13 sts, plus 4).
• Row 6: *P4, k2, p2tog, p1, ssp, k2, repeat from * to last 4 sts, p4 (multiple of 11 sts, plus 4).
• Row 7: K4, *p2, k3, p2, k4, repeat from *.
• Rows 8 and 10: *P4, k2, p3, k2, repeat from * to last 4 sts, p4.
• Row 9: K4, *p2, yo, sl1-k2tog-psso, yo, p2, k4, repeat from *.
• Repeat rows 7-10.