Shown with a cast-on count of 13 stitches.  

• Row 1 (RS): P6, k1, p6.
• Row 3 (RS): P5, k3, p5.
• Row 5 (RS): P5, M1L, k1, M1L, k1, M1L, k1, M1L, p5 (17 sts).
• Row 7 (RS): P5, k1, M1L, k1, M1L, k3, M1L, k1, M1L, k1, p5 (21 sts).
• Row 9 (RS): P3, p2tog, k2, M1L, k1, M1L, k2, M1Lp, k1, M1Lp, k2, M1L, k1, M1L, k2, p2tog, p3 (25 sts).
• Row 11 (RS): P2, p2tog, k7, M1Lp, p1, k1, p1, M1Lp, k7, p2tog, p2.
• Row 13 (RS): P1, p2tog, k2, k3tog, k2, M1Lp, p2, k1, p2, M1Lp, k2, k3tog, k2, p2tog, p1 (21 sts).
• Row 15 (RS): P2tog, k1, k3tog, k1, M1Lp, p3, k1, p3, M1Lp, k1, k3tog, k1, p2tog (17 sts).
• Row 17 (RS): P1, k3tog, p4, k1, p4, k3tog, p1 (13 sts).