DLV [build BEN/Oct 11 2007   gcc 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)]

true is bravely true, evidenced by {next(1,2), next(2,3), next(3,4), next(4,5), next(5,6), next(6,7), next(7,8), next(8,9), next(8,14), next(9,10), next(10,11), next(11,12), next(12,13), next(14,15), next(14,20), next(15,16), next(16,17), next(17,18), next(18,19), next(20,21), next(21,22), next(22,23), next(22,28), next(23,24), next(24,25), next(25,26), next(26,27), next(28,29), next(29,30), next(30,31), next(31,32), next(32,33), next(32,38), next(33,34), next(34,35), next(35,36), next(36,37), next(38,39), next(38,44), next(39,40), next(40,41), next(41,42), next(42,43), next(44,45), next(45,46), next(46,47), next(47,48), next(48,49), next(49,50), doAt(startflow,3), doAt(a21,5), doAt(a10,6), doAt(a15,7), doAt(a1,8), doAt(a3,9), doAt(a6,10), doAt(a6,16), doAt(a6,24), doAt(a6,34), doAt(a6,40), doAt(a6,47), doAt(a8,11), doAt(a8,17), doAt(a8,25), doAt(a8,35), doAt(a8,41), doAt(a8,48), doAt(endflow,12), doAt(endflow,18), doAt(endflow,26), doAt(endflow,36), doAt(endflow,42), doAt(endflow,49), 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