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(16,20), next(17,18), next(18,19), next(20,21), next(21,22), next(21,25), next(22,23), next(23,24), next(25,26), next(26,27), next(27,28), next(27,31), next(28,29), next(29,30), next(31,32), next(32,33), next(32,36), next(33,34), next(34,35), next(36,37), next(37,38), next(38,39), next(38,42), next(39,40), next(40,41), next(42,43), next(43,44), next(44,45), doAt(startflow,7), doAt(a20,9), doAt(a6,10), doAt(a16,12), doAt(a24,13), doAt(a12,14), doAt(a3,15), doAt(a7,16), doAt(a11,17), doAt(endflow,18), doAt(endflow,23), doAt(endflow,29), doAt(endflow,34), doAt(endflow,40), doAt(endflow,44), doAt(a22,20), doAt(a21,21), doAt(a9,22), doAt(a8,25), doAt(a17,26), doAt(a5,27), doAt(a13,28), doAt(a18,31), doAt(a19,32), doAt(a15,33), doAt(a2,36), doAt(a14,37), 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nextvis(18,19), nextvis(23,24), nextvis(29,30), nextvis(34,35), nextvis(40,41), nextvis(44,45)}