Row 1 (RS): K3, (k1, yo, k1) in next st, k1, *ssk, k3, yo, k1, yo, k3, k2tog, k1, repeat from * to last 4 sts, (k1, yo, k1) in next st, k3 (multiple of 12 sts, plus 13).
Rows 2, 4, 6, 8, 10, 12, and 14 (WS): K3, yo, purl to last 3 sts, yo, k3 (2 more sts).