I have a pattern that tells me to use 2 colors ( red & blue ) and ti knit a rib k2 p2 with these 2 colors in a checker board design. When I do this you can see (on the right side of sweater) each color change on the purl rows and it look terriible. The purls don't even look like checker board. How can I do this without seeing each color change on the right side. :?? :??