Chain multiple: 10 + 2
Stitch Guide
Shell: In specified st work (dc, ch 1) twice, dc in same st: shell made.
Instructions
Row 1: Sc in 2nd ch from hook and in next ch; *ch 3, sk 3 chs, shell in next ch, ch 3, sk 3 chs, sc in each of next 3 chs; rep from * across, ending last rep with sc in last 2 (instead of 3) chs; ch 1, turn.
Row 2 (RS): Sc in first sc; *ch 3, work 7 dc in center dc of next shell, ch 3, sc in center sc of next 3-sc group; rep from * across, ending last rep with sc in last sc; ch 6, turn.
Row 3: *Sc in each of next 7 dc, ch 5; rep from * across, ending last rep with sc in each of last 7 dc, ch 2, tr in last sc; ch 4, turn.
Row 4: Dc in base of ch; *ch 3, sk 2 sc, sc in each of next 3 sc, ch 3, sk 2 sc, shell in next ch-5 sp; rep from * across, ending last rep with ch 3, (dc, ch 1, dc) in 4th ch of turning ch; ch 3, turn.
Row 5: Work 3 dc in ch-1 sp; *ch 3, sk next sc, sc in next sc, sk next sc, ch 3**, work 7 dc in center dc of next shell; rep from * across, ending last rep at **; work 4 dc in turning ch-sp; ch 1, turn.
Row 6: Sc in each of first 4 dc; *ch 5, sc in each of next 7 dc; rep from * across, ending last rep with sc in last 3 dc, sc in top of turning ch; ch 1, turn.
Row 7: Sc in each of next 2 sc; *ch 3, shell in next ch-5 sp, ch 3, sc in each of center 3 dc of next 7-sc group; rep from * across, ending last rep with sc in each of last 2 sc; ch 1, turn.
Rep rows 2-7 for patt.