Slip Stitch Knitting 12: Tweed

PATTERN
Cast on a multiple of 4, +3.
Row 1 (RS): Color A, k3, * sl 1 wyib, k3, repeat from * to end.
Row 2: Color A, k3, *sl 1 wyif, k3, repeat from * to end.
Row 3: Color B, k1, *sl 1 wyib, k3, repeat from * to last 2 sts, sl 1, k1.
Row 4: Color B, k1, *sl 1 wyif, k3, repeat from * to last 2 sts, sl 1, k1.
Row 5: Color C, k3, *sl 1 wyib, k3, repeat from * to end.
Row 6: Color C, k3, *sl 1 wyif, k3, repeat from * to end.
Row 7: Color A, k3, *sl 1 wyib, k3, repeat from * to end.
Row 8: Color A, k3, *sl 1 wyif, k3, repeat from * to end.
Row 9: Color B, k1 *sl 1 wyib, k3, repeat from * to last 2 sts, sl 1, k1.
Row 10: Color B, k1, *sl 1 wyif, k3, repeat from * to last 2 sts, sl 1, k1.
Row 11: Color C, k3, *sl 1 wyib, k3, repeat from * to end.
Row 12: Color C, k3, *sl 1 wyif, k3, repeat from * to end.
Repeat rows 1 - 12.