Rank and File

Rank and File stitch is a 4 row repeat and is knitted in a multiple of 2 stitches.

Row 1 (right side): Knit all sts.
Row 2: K1, * sl 2 wyif, put yarn to back, sl the same 2 sts back to left-hand needle and knit them; repeat from * to last st, k1.
Row 3: K1, * p1, sl 1 wyib; repeat from * to last st, k1.
Row 4: K1, * sl 1 wyif, k1; repeat from * to last st, k1.

Knitting abbreviations:
Knit: K | Purl: P | Slip stitch as if to purl: Sl
With yarn in back: Wyib |  With yarn in front: Wyif.