Shown with a cast-on count of 31 stitches.  

• Rows 0, 2, 4, 6, 8, 10, 12, and 14 (WS): Purl.
• Row 1: K3tog, *k1, 3-to-3 gather, repeat from * to last 4 sts, k1, k3tog (27 sts).
• Row 3: K3tog, *k1, 3-to-3 gather, repeat from * to last 4 sts, k1, k3tog (23 sts).
• Row 5: K3tog, *k1, 3-to-3 gather, repeat from * to last 4 sts, k1, k3tog (19 sts).
• Row 7: K3tog, *k1, 3-to-3 gather, repeat from * to last 4 sts, k1, k3tog (15 sts).
• Row 9: K3tog, *k1, 3-to-3 gather, repeat from * to last 4 sts, k1, k3tog (11 sts).
• Row 11: K3tog, k1, 3-to-3 gather, k1, k3tog (7 sts).
• Row 13: K3tog, k1, k3tog (3 sts).
• Row 15: K3tog (1 st).