The problem with permit is in your head.  In Einstein's famous Riddle where, the Brit lives in the red house, the Swede keeps dogs, the Dane drinks tea and so on… the question is: who own's the fish?  Now, if you make a table, analyze the clues you can logically deduce the answer.  Problem is, by that time, the fish swam away, you probably made a mistake, and now you…