You can acquire this knowledge by completing the optionnal puzzle that require you to read and adds number (Puzzle N°7 on this link https://grumpygreen.cricket/sycrakea-puzzles/)
When you'll acquire this knowledge you may get a low grade, dont worry! just delete this monster knowledge do the puzzle once again and you'll get another grade. Do it until you get S (take me and a friend less than 4 tries).