Place a Color 3 3-1/2" square right
sides together atop a Color 1 rectangle, with all edges aligned. On the back of the top
square lightly draw a diagonal line in the direction shown at left. Sew ON this line. Cut
off the excess seam allowance, and press the remainder towards the Color 3 triangle.
repeat this procedure with a Color 2 square on the other end of the rectangle. Make four
of these units...