Position of -meH
The tips for "Purpose" have an error:
For example, "he cut the fruit with a knife" can be rephrased as "he used a knife in order to cut the fruit" taj lo' naH pe'meH or "to cut the fruit, he used a knife" naH pe'meH taj lo'.
Purpose clauses can only come at the beginning, not the end. The only correct order of these clauses is naH pe'meH taj lo'. This is one way in which purpose clauses are different than other subordinate clauses.
Thanks for pointing that out!
I've edited the tips and notes, and the change should be visible at https://www.duolingo.com/skill/kl/Purpose/tips-and-notes within a day or so.