That was the first thing I noticed too. Apparently, the reason for that is to have these nice properties:

> This set of five dice is similar to other sets of dice we have seen, in that we have a chain where Blue>Magenta>Olive>Red>Yellow>Blue.

> However, we also have a second chain, where Red>Blue>Olive>Yellow>Magenta>Red.

> Notice the first chain is ordered alphabetically, while the second chain is ordered by word-length.