Cast on 37 st. with Yarn A. Stitch first and last st together to join.
Row 1-4: k2, p2 to end
Row 5: (cable (8 st), k2, p2) twice, k2, p2 to end
Rows 6-9: k2, p2 to end.
Row 10: in yarn B, k2, p2 to end.
Row 11 -13: in yarn A, k2, p2 to end.
Row 14: in yarn B, k2, p2 to end.
Row 15: in yarn B, (cable (8 st), k2, p2) twice, k2, p2 to end