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, , , -1 , , -1 . 2, 3, 5, 7, 11, 13, 17 - . -1 - !

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1 2 3 4 5 6 7 8 9 10
11 12 13 1 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30

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http://www.workjoke.com/puzzles/puzzle1u.htm

http://alefefes.macam.ac.il/riddles/riddle.asp?n=278&miun=2

' 17 " "





25.06.2005





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