Round 2 - Sl st into the next 2-sts, sl st into ch-2 sp, ch2 (counts as dc), 1dc, ch2, 2dc into the ch-2 sp, 1dc in each of the next 3-sts, then * (2dc, ch2, 2dc) in ch-2 sp, 1dc in each of the next 3-sts, rpt from * 2 more times, sl st into top of ch-2 to join. [28dc]
Round 3 - Sl st into next st, sl st into ch-2 sp, ch1, sk 3-sts and into the 4th-st work (1tr, ch1, 1t, ch1, 1tr, ch1, 1tr, ch1, 1tr, 1ch, 1tr, ch1) then sl st into the ch-2 sp, ch1, sk 3-sts and into the 4th-st make (1tr, ch1, 1t, ch1, 1tr, ch1, 1tr, ch1, 1tr, 1ch, 1tr, ch1) and sl st in ch-2 sp.