With A, loosely make a chain approximately 60" [152 cm] long.
Round 1 (right side) Treble in 4th chain from hook, 2 trebles in each chain across, slip stitch across post of last treble made to chain at base of last treble, working across opposite side of foundation chain, chain 4, treble in same chain, 2 trebles in each chain across. Fasten off A.
Round 2 With right side facing, attach B in first treble, chain 2, half double crochet in each stitch across to last treble, half double crochet evenly across end of Boa, half double crochet in each treble across opposite side of Boa, half double crochet evenly across opposite end of Boa, slip stitch in 2nd chain of turning chain to join. Fasten off B.