Shown with a cast-on count of 25 stitches.  

• Row 1 (RS): *[K1, p1] twice, k5, p1, k1, p1, repeat from * to last st, k1.
• Row 2: *[P1, k1] twice, p5, k1, p1, k1, repeat from * to last st, p1.
• Rows 3 and 19: *P1, k1, p1, k7, p1, k1, repeat from * to last st, p1.
• Rows 4 and 20: *K1, p1, k1, p7, k1, p1, repeat from * to last st, k1.
• Rows 5 and 17: *K1, [p1, k4] twice, p1, repeat from * to last st, k1.
• Rows 6 and 18: *P1, [k1, p4] twice, k1, repeat from * to last st, p1.
• Rows 7 and 15: *P1, k4, p1, k1, p1, k4, repeat from * to last st, p1.
• Rows 8 and 16: *K1, p4, k1, p1, k1, p4, repeat from * to last st, k1.
• Rows 9 and 13: *K4, [p1, k1] twice, p1, k3, repeat from * to last st, k1.
• Rows 10 and 14: *P4, [k1, p1] twice, k1, p3, repeat from * to last st, p1.
• Row 11: *K3, [p1, k1] 3 times, p1, k2, repeat from * to last st, k1.
• Row 12: *P3, [k1, p1] 3 times, k1, p2, repeat from * to last st, p1.