Help with pattern

[gina18]

I am knitting a Debbi Bliss sweater, Basket Weave Jacket. I am confused how to knit the sleeves. The pattern for the body is a 10 row pattern, but the sleeves are a two row pattern. The direction for the sleeves are Row 1 k4p4, Row 2 purl and at end of 5th row increase at both ends and every 4th row until there are 56 stitches working increases into pattern. I don't understand how this can make a basket weave stitch. Since you begin with a knit stitch and end with a purl stitch what should the increase be, knit or purl?

[Ingrid]

When you increase in a pattern, you expand outward in pattern if that makes any sense.

I would increase on the purl rows by purling into the front and back of the end stitches. On the pattern row, work whatever stitch would be there if you were working a full pattern row. So

pkkkkppppkkkkppppk would be the next pattern row, and after the next increase you'd start with 2 purls and end with 2 knits, etc.

Clear enough?