Eyelet Lace 19: Diagonal Fern

PATTERN
Cast on a multiple of 18 stitches, plus 2.
Row 1 (RS): P2, *k9, yo, k1, yo, k3, sl1-k2tog-psso, p2, repeat from *.
Rows 2, 4, 6, 8, 10, and 12: Purl.
Row 3: P2, *k10, yo, k1, yo, k2, sl1-k2tog-psso, p2, repeat from *.
Row 5: P2, *k3tog, k4, yo, k1, yo, k3, [yo, k1] twice, sl1-k2tog-psso, p2, repeat from *.
Row 7: P2, *k3tog, k3, yo, k1, yo, k9, p2, repeat from *.
Row 9: P2, *k3tog, k2, yo, k1, yo, k10, p2, repeat from *.
Row 11: P2, *k3tog, [k1, yo] twice, k3, yo, k1, yo, k4, sl1-k2tog-psso, p2, repeat from *.
Repeat rows 1-12.
Related stitch pattern, see Eyelet Lace 19 in the round