Eyelet Lace 94: Old Shale Variation

PATTERN
Cast on a multiple of 18 stitches
Row 1 (RS): Knit.
Row 2: Purl.
Row 3: Knit.
Row 4: Knit.
Row 5: *[K2tog] 3 times, [yo, k1] 6 times, [k2tog] 3 times, repeat from *.
Row 6: Knit.
Repeat rows 1-6.
Related stitch pattern, see Eyelet Lace 94 in the round