Shown with a cast-on count of 25 stitches.  

• Row 1 (WS): *K6, p1, k5, repeat from * to last st, k1.
• Row 2: P1, *p5, k1, p6, repeat from *.
• Rows 3 and 19: *K5, p1, k1, p1, k4, repeat from * to last st, k1.
• Rows 4 and 20: P1, *p4, k3, p5, repeat from *.
• Rows 5 and 17: *K4, [p1, k1] twice, p1, k3, repeat from * to last st, k1.
• Rows 6 and 18: P1, *p3, k5, p4, repeat from *.
• Rows 7 and 15: *K3, [p1, k1] 3 times, p1, k2, repeat from * to last st, k1.
• Rows 8 and 16: P1, *p2, k7, p3, repeat from *.
• Rows 9 and 13: *K2, [p1, k1] 5 times, repeat from * to last st, k1.
• Rows 10 and 14: P1, *p1, k9, p2, repeat from *.
• Row 11: *K1, [p1, k1] 5 times, p1, repeat from * to last st, k1.
• Row 12: P1, *k11, p1, repeat from *.