Colors A, B and C
Cast on with Color A and purl one row.
Repeat Rows 1 - 6
Row #SideColorBegin RowRepeatRepeat From *End Row
1RBk1*sl 1 wyif, k1* 
2WCk1, p1*sl 1 wyib, p1 *k1
3RAk1*sl 1 wyif, k1* 
4WBk1, p1 *sl 1 wyib, p1 *k1
5RCk1*sl 1 wyif, k1* 
6WAk1, p1 *sl 1 wyib, p1 *k1