I am surprised not to see more forum entries for 22. This one seems to stand out for the sheer number of possible permutations even when taking into account some of the built-in limitations such the only two strips that can be used in the first position and the fact that only one of them can be rotated. Still even with these limitations and some of the rules for mathematical syntax there are a staggering amount of permutations to try. I have completed the first codex book and other puzzle books with my siblings and we are all stumped by this one. We are curious to know if someone has found a line of reasoning that allows to find the solution without the need for extensive manipulations.
P.S. I have the revised version of the book.