Slip Stitch Knitting 29 in the round

How to knit the K1 uls.
Take the right-hand needle under the slipped threads, then pick up the next st on the left-hand needle and knit this st and the slipped threads together.

PATTERN IN THE ROUND
Cast on a multiple of 6 stitches.
Rounds 1-3: *Sl3 wyif, p3, repeat from *.
Rounds 3-6: Purl.
Round 7: P1, *k1 uls, p5, repeat from * to last 4 sts, k1 uls, p4.
Round 8: Purl
Rounds 9-11: *P3, sl3 wyif, repeat from *.
Rounds 12-14: Purl.
Round 15: P4, *k1 uls, p5, repeat from * to last 2 sts, k1 uls, p1.
Round 16: Purl.
Repeat rounds 1-16.

Worked flat, see Trellis Slip Stitch Knitting 29