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(12,18), next(13,14), next(14,15), next(15,16), next(16,17), next(18,19), next(19,20), next(20,21), next(21,22), next(21,26), next(22,23), next(23,24), next(24,25), next(26,27), next(26,31), next(27,28), next(28,29), next(29,30), next(31,32), next(32,33), next(32,45), next(33,34), next(33,38), next(34,35), next(35,36), next(36,37), next(38,39), next(39,40), next(40,41), next(41,42), next(42,43), next(43,44), next(45,46), next(46,47), next(47,48), doAt(startflow,6), doAt(a24,7), doAt(a23,8), doAt(a4,10), doAt(a16,11), doAt(a17,12), doAt(a2,13), doAt(a14,14), doAt(a25,15), doAt(a25,23), doAt(a25,28), doAt(a25,35), doAt(a25,42), doAt(a25,46), doAt(endflow,16), doAt(endflow,24), doAt(endflow,29), doAt(endflow,36), doAt(endflow,43), doAt(endflow,47), doAt(a19,18), doAt(a13,19), doAt(a12,20), doAt(a7,21), 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nextvis(36,37), nextvis(43,44), nextvis(47,48)}