(Note: In all chain stitches, work behind the vertical bar.)
Step 1: start with 19 ch foundation chain, then from the 2nd st of hook: 18 sc, turn, 1 ch, 18 sc, turn, 1 ch, 18 sc.
Step 2: use another yarn, make 8 ch, then in the completed piece: sk 7, 2 ss. in the chain: work 7 sc, 2 sc in one st, turn, 1 ch, sk 1, 8 sc, 2 ss, 7 sc, 2 sc in one st, 1 sc.
Step 3: use another yarn, work 9 ch, then connect to the piece with 2 ss. in the chain: make 6 sc, 2 sc in one st, 2 sc, turn, 1 ch, 10 sc, 2 ss, 9 sc, 2 sc in one st.