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(10,14), next(11,12), next(12,13), next(14,15), next(15,16), next(16,17), next(17,18), next(18,19), next(19,20), next(19,38), 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(34,35), next(35,36), next(36,37), next(38,39), doAt(startflow,4), doAt(a16,5), doAt(a5,7), doAt(a20,8), doAt(a3,9), doAt(a2,10), doAt(a7,11), doAt(endflow,12), doAt(endflow,22), doAt(endflow,28), doAt(endflow,36), doAt(endflow,38), doAt(a23,14), doAt(a9,15), doAt(a22,16), doAt(a8,17), doAt(a6,18), doAt(a12,19), doAt(a14,20), doAt(a17,21), doAt(a4,24), doAt(a1,25), doAt(a18,26), doAt(a13,27), doAt(a15,30), doAt(a11,31), doAt(a25,32), doAt(a21,33), doAt(a10,34), doAt(a19,35), ineffset(startflow,x6), ineffset(startflow,x1), 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nextvis(19,38), nextvis(20,21), nextvis(20,24), nextvis(21,22), nextvis(24,25), nextvis(25,26), nextvis(26,27), nextvis(26,30), nextvis(27,28), nextvis(30,31), nextvis(31,32), nextvis(32,33), nextvis(35,36), nextvis(3,5), nextvis(10,15), nextvis(33,35), nextvis(12,13), nextvis(22,23), nextvis(28,29), nextvis(36,37), nextvis(38,39)}