28 stitches and 15 rows = 4 inches (10 cm) over stitch pattern. TAKE TIME TO CHECK YOUR GAUGE!
Pattern Stitch: 3 x 3 RIB
Row 1 and all WS rows: P3, *k3, p3, rep from * to end of row.
Row 2 and all RS rows: K3, *p3, k3, rep from * to end of row. Repeat Rows 1-2 for pat.
1. With color A, loosely cast on 39 stitches and work 3 x 3 Rib pat for 36 rows. Attach color B and continue in pattern for 36 rows.
2. Continue working 36 rows of each color in alphabetical order.
3. Bind off in pattern. Weave in ends. (For a shorter scarf, choose your favorite colors and knit to desired length.)