Shown with a cast-on count of 10 stitches.  

• Rows 1 and 9 (RS): P1, *k3, p1, repeat from * to last st, p1.
• Rows 2, 8, and 10: K1, *k1, p3, repeat from * to last st, k1.
• Row 3: P1, *p3tog, M1R, k1, M1L, repeat from * to last st, p1.
• Rows 4 and 6: K1, *p3, k1, repeat from * to last st, k1.
• Row 5: P1, *p1, k3, repeat from * to last st, p1.
• Row 7: P1, *M1R, k1, M1L, p3tog, repeat from * to last st, p1.
• Repeat rows 1-8.