Textured Knitting 16: Rank and file

PATTERN
Cast on any even number of stitches.
Row 1 (RS): Knit.
Row 2: K1, *slip 2 wyif, put yarn to back, slip the same 2 sts back to LH needle and knit them, repeat from * to last st, k1.
Row 3: K1, *p1, slip 1 wyib, repeat from * to last st, k1.
Row 4: K1, *slip 1 wyif, k1, repeat from * to last st, k1.
Repeat rows 1-4.