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(11,15), next(12,13), next(13,14), next(15,16), next(16,17), next(16,20), next(17,18), next(18,19), 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(29,30), next(29,41), next(30,31), next(31,32), next(32,33), next(33,34), next(33,37), next(34,35), next(35,36), next(37,38), next(38,39), next(39,40), next(41,42), next(42,43), 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(51,55), next(52,53), next(53,54), next(55,56), next(56,57), next(57,58), doAt(startflow,5), doAt(a5,6), doAt(a20,8), doAt(a3,10), doAt(a13,11), doAt(a25,12), doAt(endflow,13), doAt(endflow,18), doAt(endflow,35), doAt(endflow,39), doAt(endflow,53), doAt(endflow,57), doAt(a4,15), doAt(a18,16), doAt(a14,17), 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nextvis(33,34), nextvis(33,37), nextvis(34,35), nextvis(37,38), nextvis(38,39), nextvis(41,42), nextvis(42,43), nextvis(43,44), nextvis(44,45), nextvis(45,46), nextvis(46,47), nextvis(47,48), nextvis(48,49), nextvis(49,50), nextvis(50,51), nextvis(51,52), nextvis(51,55), nextvis(52,53), nextvis(55,56), nextvis(56,57), nextvis(4,6), nextvis(16,21), nextvis(21,23), nextvis(26,28), nextvis(29,31), nextvis(13,14), nextvis(18,19), nextvis(35,36), nextvis(39,40), nextvis(53,54), nextvis(57,58)}