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(17,18), next(18,19), next(19,20), 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(28,29), next(28,32), next(29,30), next(30,31), next(32,33), next(32,41), next(33,34), next(34,35), next(34,38), next(35,36), next(36,37), next(38,39), next(39,40), next(41,42), next(42,43), next(42,46), next(43,44), next(44,45), next(46,47), next(47,48), doAt(startflow,7), doAt(a1,9), doAt(a16,11), doAt(a15,12), doAt(a6,13), doAt(a18,14), doAt(a3,15), doAt(a20,16), doAt(a17,17), doAt(a10,18), doAt(a14,19), doAt(a7,20), doAt(a5,21), doAt(a8,22), doAt(endflow,23), doAt(endflow,30), doAt(endflow,36), doAt(endflow,39), doAt(endflow,44), doAt(endflow,47), doAt(a21,25), doAt(a4,26), doAt(a23,27), doAt(a2,28), doAt(a13,29), 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nextvis(44,45), nextvis(47,48)}