Base: Multiple 7 + 2 number of chains.

Row 1: 3 ch, dc in 5 ch from hook, work in dc until end of row.

Row 2: 5 ch, skip 4 sts, * 1 group (3 dc, 5 ch, 3 dc crocheted in same stitch), 5 ch, skip 6 stitches. Repeat from * until end of row, after last group: 2 ch, 1 dc in last stitch.

Row 3: 1 ch, 1 sc in first dc of previous row, * in the arch of 5 ch (4 dc, 5 ch, 4 dc), 1 sc in next arch. Repeat from * until end of row.

Row 4:  1 ch, 1 sc in first stitch; * 3 ch, in next arch: (4 dc, 5 ch, 4 dc), 3 ch, 1 sc in next sc of previous row. Repeat from * until end of row.

Row 5: 8 ch; * (in next arch: 5 sc), 2 ch. Repeat from * ending with 1 ch and triple treble crochet in last stitch of previous row.

Row 6: 1 ch, 1 sc in triple treble crochet of Repeat from row 2. previous row, 1 sc in next ch; * 1 sc in each one of the next 5 sc (in the arch), 2 sc in next 2 ch. Repeat from * until end of row.

Row 7: 4 ch, skip first 2 sc; * 1 dc, 1 ch, skip 1 dc. Repeat from * ending with 1 dc in last stitch.