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(9,10), next(10,11), next(11,12), next(12,13), next(13,14), next(14,15), next(15,16), next(16,17), next(16,24), next(17,18), next(17,21), next(18,19), next(19,20), next(21,22), next(22,23), next(24,25), next(25,26), next(26,27), next(26,30), next(27,28), next(28,29), next(30,31), next(31,32), next(32,33), next(33,34), next(34,35), next(34,38), next(35,36), next(36,37), next(38,39), next(38,45), next(39,40), next(40,41), next(41,42), next(42,43), next(43,44), next(45,46), next(46,47), next(47,48), next(48,49), next(49,50), doAt(startflow,7), doAt(a1,10), doAt(a13,11), doAt(a7,13), doAt(a17,15), doAt(a18,16), doAt(a24,17), doAt(a9,18), doAt(endflow,19), doAt(endflow,22), doAt(endflow,28), doAt(endflow,36), doAt(endflow,43), doAt(endflow,49), doAt(a10,21), doAt(a6,24), doAt(a4,25), doAt(a16,26), doAt(a14,27), doAt(a12,30), doAt(a23,31), doAt(a25,32), doAt(a8,33), 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nextvis(6,8), nextvis(19,20), nextvis(22,23)}