Judy - I have a question. You said:
For the A set, cut two 2” wide pieces of dark each measuring 19” long. Cut one piece of light measuring 3-1/2” wide and 19” long. Sew 2” wide pieces of dark to each side of the 3-1/2” light. Press to the dark. This strip set will measure 6-1/2” wide. Make sure the width is correct. Slice this set into 12 segments as shown; they will measure 2” wide by 6-1/2”.
When finished with this step, the strip will be 19" long by 6 1/2" wide. How can you cut 12 - 2" wide pieces from 19"? Should it have been 24"? I'm confused.