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(6,30), 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(22,23), next(23,24), next(24,25), next(25,26), next(26,27), next(27,28), next(28,29), next(30,31), next(31,32), next(32,33), next(32,55), next(33,34), next(34,35), next(35,36), next(36,37), next(37,38), next(37,43), next(38,39), next(39,40), next(40,41), next(41,42), next(43,44), next(44,45), next(45,46), next(46,47), next(47,48), next(48,49), next(49,50), next(50,51), next(51,52), next(52,53), next(53,54), next(55,56), next(56,57), next(57,58), next(58,59), next(59,60), next(59,65), next(60,61), next(61,62), next(62,63), next(63,64), next(65,66), next(66,67), next(67,68), next(68,69), next(69,70), next(70,71), next(71,72), next(72,73), next(73,74), next(74,75), next(75,76), 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nextvis(16,17), nextvis(28,29), nextvis(41,42), nextvis(53,54), nextvis(63,64), nextvis(75,76)}