(Note: In all chain stitches, work behind the vertical bar.)
Step 1: Start with 19 ch foundation chain, then from 2nd st of hook: 18 sc, turn, 1 ch, 18 sc, turn, 1 ch, 18 sc.
Step 2: Use another yarn, work in the just completed piece: sk 9, 12 ch, sk 5, 2 ss. Then in the chain, work 2 sc, 2 sc in next st, 1 sc, 1 hdc, (2 hdc in next st)*2 times, 1 sc, 2 sc in next st, 2 sc, sk 1, 2 ss, 5 sc, (2 hdc in next st)*5 tiems, 5 sc, 1 ss.
Step 3: Use another yarn, 9 ch, connect with the piece with 2 ss, then work in the chain: 8 sc, 2 sc in next st, turn, 1 ch, 10 sc, 2 ss, turn, 9 sc, 2 sc in next st.