With Color A- Chain 251

Row 1: sc in 2nd ch from the hook. 1 sc in each of the net 8 ch, * 3 sc in next ch, 1 sc in each of next 9 ch, skip 2 ch, 1 sc in each of next 9 ch, repeat from * to last 10 ch, work 3 sc in next ch, 1 sc in each of next 9 ch, ch 1, turn.

Row 2. Skip 1 sc, 1 sc in back loop of each of next 9 sc, *3 sc in back loop of next sc, 1 sc in back loop of each of next 9 sc, skip 2 sc, 1 sc in back loop of each of next 9 sc, repeat from *across, end 3 sc in back loop of next sc, 1 sc in back loop of each of next 9 sc, leaving last stitch unworked, ch 1, turn.

Repeat Row 2 for pattern working 6 more rows with Color A, work off last sc with Color B. Repeat Row 2 working stripes of 8 rows each Colors B, C & A. Working until there are 21 stripes. Fasten off.