World Download provider results:
prolog.full.rar :: 2011-07-14 :: Speed: 989 Kb/s
prolog [FullVersion] :: 2011-07-10 :: Speed: 1829 Kb/s
[HIGHSPEED] prolog :: 2011-07-13 :: Speed: 689 Kb/s
[TRUSTED DOWNLOAD] prolog :: 2011-07-15 :: Speed: 836 Kb/s
TORRENT.CD DOWNLOAD prolog :: 2010-10-15 :: Speed: 1537 Kb/s

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Site results:

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Crackdb.com results:
PDC Visual Prolog v7.0 Personal :: 6 Kb :: 22.06.07
Visual Prolog v7.1 :: 1 Kb :: 17.11.07

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SerialNews.com results:
Visual Prolog v7.1-YAG :: 367 b :: 17.11.07