(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.
Step 2: 9 ch, then from 2nd st of hook: 8 sc, 2 ss, 8 sc.
Step 3: 1 ch, 8 sc, 1 ss, 5 sc, 6 ch, then from 2nd st of hook: 5 sc, 1 ss, 6 sc.
Step 4: 9 ch, then from 2nd st of hook: 8 sc, 2 ss, 8 sc, turn, 1 ch, 8 sc, 1 ss.