With A, chain 13.
Set up Row: Single crochet in 3rd chain from hook, *chain 1, skip next chain, single crochet in next chain; repeat from * across.
Row 1: Chain 1, turn, single crochet in first stitch, *chain 1, skip next chain-1 space, single crochet in next stitch; repeat from * across.
Change to B.
Rows 2 and 3: With B, repeat Row 1.
Change to A.
Rows 4 and 5: With A, repeat Row 1.
Repeat Rows 2-5 until piece measures about 55 in.(140 cm) from beginning.
Weave in ends.