Shown with a cast-on count of 40 stitches.  

• Row 1 (RS): P7, [p6, k1, p6] twice, p7.
• Rows 2 and 18: P7, [p6, k1, p6] twice, p7.
• Row 3: P7, [p5, k3, p5] twice, p7.
• Row 4: P7, [p5, k3, p5] twice, p7.
• Row 5: P7, [p5, M1L, k1, M1L, k1, M1L, k1, M1L, p5] twice, p7 (48 sts).
• Row 6: P7, [p5, k7, p5] twice, p7.
• Row 7: P7, [p5, k1, M1L, k1, M1L, k3, M1L, k1, M1L, k1, p5] twice, p7 (56 sts).
• Row 8: P7, [p5, k11, p5] twice, p7.
• Row 9: P7, [p3, p2tog, k2, M1L, k1, M1L, k2, M1Lp, k1, M1Lp, k2, M1L, k1, M1L, k2, p2tog, p3] twice, p7 (64 sts).
• Row 10: P7, [p4, k7, p1, k1, p1, k7, p4] twice, p7.
• Row 11: P7, [p2, p2tog, k7, M1Lp, p1, k1, p1, M1Lp, k7, p2tog, p2] twice, p7.
• Row 12: P7, [p3, k7, p2, k1, p2, k7, p3] twice, p7.
• Row 13: P7, [p1, p2tog, k2, k3tog, k2, M1Lp, p2, k1, p2, M1Lp, k2, k3tog, k2, p2tog, p1] twice, p7 (56 sts).
• Row 14: P7, [p2, k5, p3, k1, p3, k5, p2] twice, p7.
• Row 15: P7, [p2tog, k1, k3tog, k1, M1Lp, p3, k1, p3, M1Lp, k1, k3tog, k1, p2tog] twice, p7 (48 sts).
• Row 16: P7, [p1, k3, p4, k1, p4, k3, p1] twice, p7.
• Row 17: P7, [p1, k3tog, p4, k1, p4, k3tog, p1] twice, p7 (40 sts).