I found that using 1/4" seams, strips were less than 44" would not allow making 3 pairs of HST. So after making the strip sets, I went back to re-seaming using 3/8" seams. That fixed the problem and I was able to get the 3 sets from the strip sets. A word to the wise: Measure the length of the strips before you start making the strip set. My strips were only 42" including the selvedges. (Ron might want to make note of that in the instructions).