Shown with a cast-on count of 38 stitches.  

• Row 1 (RS): K4, 1/2 RC, 1/2 LC, *k6, 1/2 RC, 1/2 LC, repeat from * to last 4 sts, k4.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: Purl.
• Row 3: K3, 1/2 RC, k2, 1/2 LC, *k4, 1/2 RC, k2, 1/2 LC, repeat from * to last 3 sts, k3.
• Row 5: *K2, 1/2 RC, k4, 1/2 LC, repeat from * to last 2 sts, k2.
• Row 7: K1, *1/2 RC, k6, 1/2 LC, repeat from * to last st, k1.
• Row 9: K11, *2/2 RC, k8, repeat from * to last 3 sts, k3.
• Row 11: K1, *1/2 LC, k6, 1/2 RC, repeat from * to last st, k1.
• Row 13: *K2, 1/2 LC, k4, 1/2 RC, repeat from * to last 2 sts, k2.
• Row 15: K3, 1/2 LC, k2, 1/2 RC, *k4, 1/2 LC, k2, 1/2 RC, repeat from * to last 3 sts, k3.
• Row 17: K4, 1/2 LC, 1/2 RC, *k6, 1/2 LC, 1/2 RC, repeat from * to last 4 sts, k4.
• Row 19: K5, 2/2 RC, *k8, 2/2 RC, repeat from * to last 5 sts, k5.