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| Keywords: Water gaz electricity Dudeney.jpg en Original graph taken from http //www gutenberg org/files/16713/16713-h/16713-h htm POINTS_AND_LINES_PROBLEMS Amusements in mathematics for water gaz electricity enigma fr Dessin original de Henry Dudeney pour l'énigme des trois maisons tiré du livre http //www gutenberg org/files/16713/16713-h/16713-h htm POINTS_AND_LINES_PROBLEMS Amusements in mathematics Dudeney Amusements in mathematics 1917 Henry Dudeney 1857 1930 1917 PD-old Networks | ||||
