Wave and Butterfly Knitting. 2 color slip stitch pattern. Great knit pattern

Color A, cast on a multiple of 10, + 9 sts.
Row 1 - RS: Color A. knit.
Row 2: Color A, knit.
Rows 3, 5, 7, 9, 11: Color B, k2, * sl 5 wyif, k5; rep from * to last 7 sts, sl 5 wyif, k2.
Rows 4, 6, 8, 10: Color A, purl.
Row 12: Color B, p4, * p1 uls, p9; rep from * to last 5 sts, p1 uls, p4.
Row 13: Color A, knit.
Row 14: Color A, knit.
Rows 15, 17, 19, 21, 23: Color B, k7, * sl 5 wyif, k5; rep from * to last 2 sts, k2.
Rows 16, 18, 20, 22: Color B, purl.
Row 24: Color A, p9, * p1 uls, p9; rep from * to end.
Repeat Rows 1 - 24.

Knitting abbreviations:
K: Knit | P: Purl.
SL wyif: Slip stitch purlwise with yarn in front.
P1 uls: Purl 1 under loose strands. Insert right hand needle down through the 5 loose strands below next stitch, purl these 5 strands together with next stitch on needle.