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(9,14), next(10,11), next(11,12), next(12,13), next(14,15), next(15,16), next(16,17), next(17,18), next(17,35), next(18,19), next(19,20), next(20,21), next(20,24), 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(35,36), next(36,37), next(37,38), next(38,39), next(39,40), next(40,41), next(40,44), next(41,42), next(42,43), next(44,45), next(45,46), next(46,47), next(46,50), next(47,48), next(48,49), next(50,51), next(51,52), next(52,53), next(53,54), doAt(startflow,4), doAt(a1,6), doAt(a6,8), doAt(a22,9), doAt(a19,10), doAt(a25,11), doAt(endflow,12), doAt(endflow,22), doAt(endflow,28), doAt(endflow,33), doAt(endflow,42), doAt(endflow,48), doAt(endflow,53), doAt(a15,14), doAt(a14,15), doAt(a5,16), doAt(a7,17), doAt(a16,18), doAt(a4,19), 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nextvis(40,41), nextvis(40,44), nextvis(41,42), nextvis(44,45), nextvis(45,46), nextvis(46,47), nextvis(46,50), nextvis(47,48), nextvis(50,51), nextvis(51,52), nextvis(52,53), nextvis(3,5), nextvis(6,9), nextvis(12,13), nextvis(22,23), nextvis(28,29), nextvis(33,34), nextvis(42,43), nextvis(48,49), nextvis(53,54)}