This DROPS video shows how to generally create a wave pattern on a knitted garment by working decreases and yarn overs.
In this video we are following a pattern repeat with 17 sts in width and 4 rows in height.

1st row (RS): *K2 tog 3 times, yo, K1, yo, K1, yo, K1, yo, K1, yo, K1, yo, K2 tog 3 times*, rep *-*.
2nd row (WS): K all sts (they will be purled seen from RS)
3rd row: K all sts
4th row: P all sts

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