Brilliantly done, Republican! I admire your logic! :) Yes, the same night I thought I solved the riddle, I asked one of my friends if she could solve it, and when trying to explain how it could be solved, I found I was mistaken myself. Yes, until third step, it works okay, then it doesn't. Well, you did it, now I don't see the necessity of doing it another way, if there is. Also, I am still confused what is the necessity of 43L jar; any big jar just works fine, innit? I even haven't read the other question posted by you; I will try to do it if it is interesting. :)