Morse Code
Cast on any number of stitches.
Knit 5 rows of garter stitch (all knit rows).
Start of pattern
Row 1: knit
Row 2: k5, purl to last 5 st's, k5
Row 3: k5, *yfwd, k2tog* repeat until last 5 st's, k5.
Row 4: k5, purl to last 5 st's, k5.
Row 5: k
Row 6: k
Row 7: k
Row 8: k5, *p1, k1* repeat to last 5 st's, k5.
Row 9: k
Row 10: k
repeat these 10 rows until desired length (until your square is square) then knit 5 rows of garter stitch. Cast off.
Abbreviations used
yfwd: bring yarn to front of work as if you were to purl, this just makes a loose stitch when doing a knit stitch.
k2tog: knit two stitches together.