CL (3-dc cluster) 3 dc in same st.
(multiple of 6 sts + 1)
Row 1 (RS) Ch 1, 1 sc in first and each st across.
Row 2 (RS) Ch 1, 1 sc in first 3 sc, *3 sc in next sc, 1 sc in 5 sc; rep from *, end last rep 1 sc in last 3 sc.
Row 3 (RS) Ch 3, skip 2 sc, *CL in center st of next 3-sc group, ch 2, skip 2 sc, 1 sc in next sc, ch 2, skip 2 sc; rep from *, end CL in center sc of last 3-sc group, ch 2, skip 2 sc, 1 sc in last sc.