Eyelet Lace 91 in the round

PATTERN IN THE ROUND
Cast on a multiple of 18 stitches
Round 1: Knit.
Round 2: Knit.
Round 3: *[P2tog] 3 times, [yo, k1] 6 times, [P2tog] 3 times, repeat from *.
Round 4: Knit.
Repeat rounds 1-4.

Worked flat, see: Old Shale Eyelet Lace 91