Now place a Color 3 square right sides together atop a Color
1 rectangle, with outer edges
aligned. On the back of the top square lightly mark the diagonal. Sew on this
diagonal marking. Cut off the excess seam allowance. Press the remainder towards
the corner. Repeat this with another Color 3 square on the other end of the
rectangle. Make two units like that.
In the same way, sew six of the next rectangle units shown at
left, noting that the angle of stitching is parallel this time...
Then sew two more with the angle of stitching also parallel but
slanting in the opposite direction...
Lastly sew two more just like the first rectangle units, but
this time use Color 3 rectangles and Color 1 squares...