Eyelet Lace 25: Shell

PATTERN
Cast on a multiple of 18 sts, +1.
Row 1 (RS): K1, *yo, p7, sl2-k1-p2sso, p7, yo, k1, repeat from *.
Rows 2, 4, 6, 8, 10, 12, and 14: Purl.
Row 3: K1, *yo, k1, yo, ssk, p4, sl2-k1-p2sso, p4, k2tog, yo, k1, yo, k1, repeat from *.
Row 5: K1, *yo, k2, yo, ssk, p3, sl2-k1-p2sso, p3, k2tog, yo, k2, yo, k1, repeat from *.
Row 7: K1, *yo, k3, yo, ssk, p2, sl2-k1-p2sso, p2, k2tog, yo, k3, yo, k1, repeat from *.
Row 9: K1, *yo, k4, yo, ssk, p1, sl2-k1-p2sso, p1, k2tog, yo, k4, yo, k1, repeat from *.
Row 11: K1, *yo, k5, yo, ssk, sl2-k1-p2sso, k2tog, yo, k5, yo, k1, repeat from *.
Row 13: K1, *yo, k7, sl2-k1-p2sso, k7, yo, k1, repeat from *.
Repeat rows 1-14.
Related stitch pattern, see Eyelet Lace 25 in the round