Back I went to the the graph paper and needles this morning. I now have what I truly hope is the last intarsia swatch. 30 stitches by 40 rows, four colors.
The absolute final intarsia swatch
I did learn something besides remembering to triple check directions before you design and that was weaving in yarn ends a different way. This time I wove them in diagonally. Some knitting books say to weave ends in vertically on the back side, others tell you to weave them in diagonally. This time I tried it diagonally (probably because I just started reading the first Harry Potter book and noticed with amusement that the shopping area under London was called DIAGON ALley).
You really can't see the weaving on the front side.