Double moss stitch

As if I haven't got enough to do, to use up the cheap double knit wool I've got left I decided to make a sampler blanket of lots of stitches that I like, so I got the book Knit and Purl Stitches: 250 to knit by Erika Knight from the library and set to.  Unfortunately the book doesn't give any tensions so I'm just using size 7 needles, double knit wool and casting on 35 stitches and hoping for the best...  The swatches give me a nice break, I can do one in a few hours depending on complexity.  The multiples number is self explanatory, the plus number is the number of balancing stitches I needed to add on, so 34 is a multiple of 2 plus 1 is 35, great.  Sure it won't always be so easy!
 Double Moss Stich
Multiple of 2 + 1
1st row: k1, *p1, k1; rep from * to end
2nd row: p1, *k1, p1; rep from * to end
3rd row: As 2nd row
4th row: As 1st row
Rep these 4 rows