Six students A, B, C, D, E, and F went to the library once last Monday nigh One of them stole a book. Each student is questioned about whom they sa at the library, and all tell the truth except the thief (it is possible that on student saw another without in turn being seen, but we assume that if on student sees another an arc is drawn with arrow leaving the student who say the other). That is, A saw B and E; B saw A and F; C saw D and F; D saw A an F; E saw B and C and F saw C and E. Draw a directed graph illustrating th given scenario. If the least number of occurrences being seen at the librar makes a person the most probable thief, then who is the thief?

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