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(9,18), next(10,11), next(10,14), next(11,12), next(12,13), 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(22,26), next(23,24), next(24,25), next(26,27), next(26,30), next(27,28), next(28,29), next(30,31), next(30,34), next(31,32), next(32,33), next(34,35), next(35,36), next(36,37), next(37,38), next(38,39), next(39,40), next(40,41), doAt(startflow,3), doAt(a5,6), doAt(a1,7), doAt(a10,8), doAt(a2,9), doAt(a20,10), doAt(a7,11), doAt(endflow,12), doAt(endflow,16), doAt(endflow,24), doAt(endflow,28), doAt(endflow,32), doAt(endflow,40), doAt(a16,14), doAt(a8,15), doAt(a24,18), doAt(a17,19), doAt(a21,20), doAt(a15,21), doAt(a6,22), doAt(a4,23), doAt(a25,26), doAt(a11,27), doAt(a22,30), doAt(a14,31), doAt(a19,34), doAt(a9,35), doAt(a3,36), doAt(a18,37), doAt(a23,38), doAt(a12,39), 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do(a9,35), do(a3,36), do(a18,37), do(a23,38), do(a12,39), comp(a5,2,x20,4), nextvis(4,5), nextvis(5,6), nextvis(6,7), nextvis(7,8), nextvis(8,9), nextvis(9,10), nextvis(9,18), nextvis(10,11), nextvis(11,12), nextvis(15,16), nextvis(18,19), nextvis(19,20), nextvis(20,21), nextvis(21,22), nextvis(22,23), nextvis(22,26), nextvis(23,24), nextvis(26,27), nextvis(26,30), nextvis(27,28), nextvis(30,31), nextvis(30,34), nextvis(31,32), nextvis(34,35), nextvis(35,36), nextvis(36,37), nextvis(37,38), nextvis(38,39), nextvis(39,40), nextvis(2,4), nextvis(10,15), nextvis(12,13), nextvis(16,17), nextvis(24,25), nextvis(28,29), nextvis(32,33), nextvis(40,41)}