Chain multiple: 10 + 2

Instructions

Row 1: Sc in 2nd ch from hook and in each rem ch; ch 3 (counts as first dc of following row), turn.

Row 2: *Dc in next 2 sts, ch 3, sk next 2 sts, sc in next st; ch 3, sk 2 sts, dc in next 3 sts; rep from * across ch 3, turn.

Row 3: *Dc in next 2 sts, ch 1, sc in next ch-3 sp; ch 3, sc in next ch-3 sp; ch 1, dc in next 3 sts; rep from * across, ch 3, turn.

Row 4: *Dc in next 2 dc; in next ch-3 sp work shell of (2 dc, ch 1, 2 dc); dc in next 3 dc; rep from * across; ch 3, turn. 

Row 5: *Dc in next 2 sts, ch 3, sk next 2 sts, sc in next ch-1 sp of shell; ch 3, sk 2 sts, dc in next 3 sts; rep from * across, ch 3, turn.

Rep rows 3-5 for patt.