Wave and Box Slip Stitch Pattern

Pattern
Use two double-point needles (or a circular needle). 
Cast on a multiple of 10 sts, plus 5.
Row 1 (RS): Color B, knit. Then slip sts to other end of needle.
Row 2 (RS): Color A, knit.
Row 3 (WS): Color B, P1, *SL3 wyif, P7; rep from * to last 4 sts, SL3, P1.
Do not turn, slide sts back to opposite end of needle.
Row 4 (WS): Color A, purl.
Row 5: Color B, K1, *SL3 wyib, K7; rep from * to last 4 sts, SL3, K1.
Do not turn, slide sts back to opposite end of needle.
Row 6: Color A, knit.
Row 7: Color B, P1, *SL3 wyif, P7; rep from * to last 4 sts, SL3, P1.
Do not turn, slide sts back to opposite end of needle.
Row 8: Color A, purl.
Row 9: Color B, knit.
Do not turn, slide sts back to opposite end of needle.
Row 10: Color A, knit.
Row 11: Color B, P6, *SL3 wyif, P7; rep from * to last 9 sts, SL3, P6.
Do not turn, slide sts back to opposite end of needle.
Row 12: Color A, purl.
Row 13: Color B, K6, *SL3 wyib, K7; rep from * to last 9 sts, SL3, K6.
Do not turn, slide sts back to opposite end of needle.
Row 14: Color A, knit.
Row 15: Color B, P6, *SL3 wyif, P7; rep from * to last 9 sts, SL3, P6.
Do not turn, slide sts back to opposite end of needle.
Row 16: Color A, purl.
Rep Rows 1-16.