(Note: In all chain stitches, work behind the vertical bar.)
Step 1: start with the foundation chain: 19 ch, then in the second chain from your hook, work 18 sc.
Step 2: turn, 1 ch, 18 sc, turn, 1 ch, 18 sc, turn, 3 ss.
Step 3: 10 ch, sk 5, 2 dc, 10 ch, sk 5, 2 ss.
Step 4: turn, in the chain: 2 sc, 2 sc in next st, 1 sc, 2 hdc in next st, 1 hdc, 2 hdc in next st, 2 sc in next st, 1 sc, sk 1, 1 ss in the dc st.
Step 5: sk 1, in the chain: 1 sc, 2 sc in next st, 2 hdc in next st, 1 hdc, 2 hdc in next st, 1 sc, 2 sc in next st, 2 sc, 2 ss.
Step 6: turn, 5 sc, (2 hdc in next st)*5 times, 1 sc, 1 ss, sk 3, 1 ss, 1 sc, (2 hdc in next st)*5 times, 5 sc, 1 ss.