Slip Stitch Knitting 16: Wave and Box

Use two double-point needles (or a circular needle).
PATTERN
Cast on a multiple of 10, +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, *sl 3 wyif, p7, repeat from * to last 4 sts, sl 3 wyif, p1.
Do not turn, slide sts back to opposite end of needle.
Row 4 (WS): Color A, purl.
Row 5: Color B, k1, *sl 3 wyib, k7, repeat from * to last 4 sts, sl 3 wyib, k1.
Do not turn, slide sts back to opposite end of needle.
Row 6: Color A, knit.
Row 7: Color B, p1, *sl 3 wyif, p7, repeat from * to last 4 sts, sl 3 wyif, 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, *sl 3 wyif, p7, repeat from * to last 9 sts, sl 3 wyif, p6.
Do not turn, slide sts back to opposite end of needle.
Row 12: Color A, purl.
Row 13: Color B, k6, *sl 3 wyib, k7, repeat from * to last 9 sts, sl 3 wyib, k6.
Do not turn, slide sts back to opposite end of needle.
Row 14: Color A, knit.
Row 15: Color B, p6, *sl 3 wyif, p7, repeat from * to last 9 sts, sl 3 wyif, p6.
Do not turn, slide sts back to opposite end of needle.
Row 16: Color A, purl.
Repeat rows 1-16.