Shown with a cast-on count of 41 stitches.  

• Row 1 (RS): Purl.
• Rows 2 and 16: *K1, [p2, k1] twice, p10, k1, p2, repeat from * to last st, k1.
• Rows 3, 17, and 19: *P1, k2, p1, k10, [p1, k2] twice, repeat from * to last st, p1.
• Row 4: *K7, p3, k4, p3, k3, repeat from * to last st, k1.
• Rows 5, 7, and 13: *P1, k6, p1, k2, p1, k6, p1, k2, repeat from * to last st, p1.
• Rows 6, 12, and 14: *K1, p2, k1, p6, k1, p2, k1, p6, repeat from * to last st, k1.
• Row 8: *K1, p2, k1, p2, k5, p2, k5, p2, repeat from * to last st, k1.
• Row 9: *P1, k2, p1, k4, p2, k4, p1, k2, p1, k2, repeat from * to last st, p1.
• Row 10: *K1, [p2, k1] twice, p4, k2, p4, k1, p2, repeat from * to last st, k1.
• Row 11: *P1, k2, p5, k2, p5, k2, p1, k2, repeat from * to last st, p1.
• Row 15: *[P4, k3] twice, p6, repeat from * to last st, p1.
• Row 18: Knit.
• Row 20: *[K1, p2] twice, k1, p10, k1, p2, repeat from * to last st, k1.