OH 11
Part One:
Find out how many strings you need and of which color. The Sefray says to sew the ssissth directly on the tallith - in contrast to present practice of making a hole. Two holes are better than one. Techeleth was not discovered, it was here all along.
Part 2
Three different answers regarding the number of blue strings. Rashi and Tosafot agree on an approach, but they fail to prove their case.