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(5,50), next(6,7), next(7,8), next(8,9), next(8,21), 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(21,22), next(22,23), next(22,35), next(23,24), next(24,25), next(25,26), next(26,27), next(27,28), next(28,29), next(29,30), next(30,31), next(31,32), next(32,33), next(33,34), next(35,36), next(36,37), next(37,38), next(38,39), next(39,40), next(40,41), 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(50,51), next(51,52), next(52,53), next(53,54), next(54,55), next(54,68), next(55,56), next(56,57), next(57,58), next(58,59), next(59,60), next(60,61), next(61,62), next(62,63), next(63,64), next(64,65), next(65,66), next(66,67), next(68,69), next(69,70), next(69,83), next(70,71), next(71,72), next(72,73), next(73,74), next(74,75), next(75,76), next(76,77), next(77,78), next(78,79), next(79,80), next(80,81), next(81,82), next(83,84), next(84,85), next(85,86), next(86,87), next(87,88), next(88,89), next(89,90), next(90,91), next(91,92), next(92,93), next(93,94), next(94,95), next(95,96), next(96,97), next(97,98), doAt(startflow,4), doAt(a25,5), doAt(a18,6), doAt(a3,7), doAt(a3,53), doAt(a9,8), doAt(a9,54), doAt(a8,9), doAt(a8,55), doAt(a10,10), doAt(a10,24), doAt(a10,39), doAt(a10,56), doAt(a10,71), doAt(a10,87), doAt(a19,11), doAt(a19,25), doAt(a19,40), doAt(a19,57), doAt(a19,72), doAt(a19,88), doAt(a20,12), doAt(a20,26), doAt(a20,41), doAt(a20,58), doAt(a20,73), doAt(a20,89), doAt(a16,13), doAt(a16,27), doAt(a16,42), doAt(a16,59), doAt(a16,74), doAt(a16,90), doAt(a5,14), doAt(a5,28), doAt(a5,43), doAt(a5,60), doAt(a5,75), doAt(a5,91), doAt(a4,15), doAt(a4,29), doAt(a4,44), doAt(a4,61), doAt(a4,76), doAt(a4,92), doAt(a15,16), doAt(a15,30), doAt(a15,45), doAt(a15,62), doAt(a15,77), doAt(a15,93), doAt(a17,17), doAt(a17,31), doAt(a17,46), doAt(a17,63), doAt(a17,78), doAt(a17,94), doAt(a6,18), doAt(a6,32), doAt(a6,47), doAt(a6,64), doAt(a6,79), doAt(a6,95), doAt(endflow,19), doAt(endflow,33), doAt(endflow,48), doAt(endflow,66), doAt(endflow,81), doAt(endflow,97), doAt(a13,21), doAt(a13,68), doAt(a23,22), doAt(a23,69), doAt(a12,23), doAt(a12,70), doAt(a22,35), doAt(a22,83), doAt(a11,36), doAt(a11,84), doAt(a24,37), doAt(a24,85), doAt(a21,38), doAt(a21,86), doAt(a14,50), doAt(a7,51), doAt(a1,52), ineffset(startflow,x19), ineffset(startflow,x1), ineffset(startflow,x2), ineffset(startflow,x3), ineffset(startflow,x4), ineffset(startflow,x5), ineffset(startflow,x6), ineffset(startflow,x7), ineffset(startflow,x8), ineffset(startflow,x9), ineffset(startflow,x10), ineffset(startflow,x11), ineffset(startflow,x12), ineffset(startflow,x13), ineffset(startflow,x14), ineffset(startflow,x15), ineffset(startflow,x16), ineffset(startflow,x17), ineffset(startflow,x18), ineffset(startflow,x20), ineffset(startflow,x21), ineffset(startflow,x22), ineffset(startflow,x23), ineffset(startflow,x24), ineffset(startflow,x25), ineffset(a25,co50), ineffset(a25,co51), ineffset(a18,x19), ineffset(a3,x2), ineffset(a3,x8), ineffset(a3,x9), ineffset(a3,x12), ineffset(a9,co18), ineffset(a9,co19), ineffset(a8,x14), ineffset(a8,x23), ineffset(a8,x25), ineffset(a10,x3), ineffset(a10,x6), ineffset(a10,x25), ineffset(a19,x4), ineffset(a19,x24), ineffset(a20,x2), ineffset(a16,x3), ineffset(a16,x6), ineffset(a16,x21), ineffset(a5,x10), ineffset(a5,x20), ineffset(a4,x5), ineffset(a4,x12), ineffset(a4,x13), ineffset(a4,x20), ineffset(a15,x22), ineffset(a17,x23), ineffset(a6,x16), ineffset(endflow,x4), ineffset(endflow,x18), ineffset(endflow,x21), ineffset(endflow,finished), ineffset(a13,x12), ineffset(a23,co46), ineffset(a23,co47), ineffset(a12,x3), ineffset(a22,x5), ineffset(a22,x16), ineffset(a11,x8), ineffset(a11,x13), ineffset(a24,x21), ineffset(a21,x9), ineffset(a14,x2), ineffset(a14,x7), ineffset(a14,x21), ineffset(a7,x5), ineffset(a7,x20), ineffset(a7,x24), ineffset(a1,x9), activity(startflow), activity(a25), activity(a18), activity(a3), activity(a9), activity(a8), activity(a10), activity(a19), activity(a20), activity(a16), activity(a5), activity(a4), activity(a15), activity(a17), activity(a6), activity(endflow), activity(a13), activity(a23), activity(a12), activity(a22), activity(a11), activity(a24), activity(a21), activity(a14), activity(a7), activity(a1), effectsObserved(startflow,1), effectsObserved(a25,2), effectsObserved(a18,3), inreadset(a25,x18), inreadset(a18,x25), inreadset(a3,x8), inreadset(a3,x16), inreadset(a3,x23), inreadset(a9,x12), inreadset(a8,x25), inreadset(a10,x12), inreadset(a10,x25), inreadset(a19,x9), inreadset(a19,x20), inreadset(a20,x1), inreadset(a20,x23), inreadset(a20,x25), inreadset(a16,x21), inreadset(a5,x6), inreadset(a5,x11), inreadset(a4,x17), inreadset(a15,x4), inreadset(a17,x22), inreadset(a17,x23), inreadset(a6,x21), inreadset(endflow,x19), inreadset(endflow,x1), inreadset(endflow,x2), inreadset(endflow,x3), inreadset(endflow,x4), inreadset(endflow,x5), inreadset(endflow,x6), inreadset(endflow,x7), inreadset(endflow,x8), inreadset(endflow,x9), inreadset(endflow,x10), inreadset(endflow,x11), inreadset(endflow,x12), inreadset(endflow,x13), inreadset(endflow,x14), inreadset(endflow,x15), inreadset(endflow,x16), inreadset(endflow,x17), inreadset(endflow,x18), inreadset(endflow,x20), inreadset(endflow,x21), inreadset(endflow,x22), inreadset(endflow,x23), inreadset(endflow,x24), inreadset(endflow,x25), inreadset(endflow,co50), inreadset(endflow,co51), inreadset(endflow,co18), inreadset(endflow,co19), inreadset(endflow,co46), inreadset(endflow,co47), inreadset(endflow,finished), inreadset(a13,x5), inreadset(a23,x2), inreadset(a12,x12), inreadset(a22,x7), inreadset(a22,x14), inreadset(a11,x7), inreadset(a24,x14), inreadset(a24,x21), inreadset(a21,x2), inreadset(a21,x9), inreadset(a21,x20), inreadset(a14,x2), inreadset(a14,x7), inreadset(a14,x8), inreadset(a7,x13), inreadset(a1,x12), inreadset(a1,x21), inreadset(a1,x22), do(startflow,1), do(a25,2), do(a18,3), nextvis(1,2), nextvis(2,3), do(a18,6), do(a3,7), impossible(a,53), do(a9,8), impossible(a,54), do(a8,9), impossible(a,55), do(a10,10), do(a10,24), do(a10,39), impossible(a,56), impossible(a,71), impossible(a,87), do(a19,11), do(a19,25), do(a19,40), impossible(a,57), impossible(a,72), impossible(a,88), do(a20,12), do(a20,26), do(a20,41), impossible(a,58), impossible(a,73), impossible(a,89), do(a16,13), do(a16,27), do(a16,42), impossible(a,59), impossible(a,74), impossible(a,90), do(a5,14), do(a5,28), do(a5,43), impossible(a,60), impossible(a,75), impossible(a,91), do(a4,15), do(a4,29), do(a4,44), impossible(a,61), impossible(a,76), impossible(a,92), do(a15,16), do(a15,30), do(a15,45), impossible(a,62), impossible(a,77), impossible(a,93), do(a17,17), do(a17,31), do(a17,46), impossible(a,63), impossible(a,78), impossible(a,94), do(a6,18), do(a6,32), do(a6,47), impossible(a,64), impossible(a,79), impossible(a,95), do(endflow,19), do(endflow,33), do(endflow,48), impossible(a,66), impossible(a,81), impossible(a,97), do(a13,21), impossible(a,68), do(a23,22), impossible(a,69), do(a12,23), impossible(a,70), do(a22,35), impossible(a,83), do(a11,36), impossible(a,84), do(a24,37), impossible(a,85), do(a21,38), impossible(a,86), impossible(a,50), impossible(a,51), impossible(a,52), impossible(a,65), impossible(a,80), impossible(a,96), impossible(a,67), impossible(a,82), impossible(a,98), nextvis(6,7), nextvis(7,8), nextvis(8,9), nextvis(8,21), nextvis(9,10), nextvis(10,11), nextvis(11,12), nextvis(12,13), nextvis(13,14), nextvis(14,15), nextvis(15,16), nextvis(16,17), nextvis(17,18), nextvis(18,19), nextvis(21,22), nextvis(22,23), nextvis(22,35), nextvis(23,24), nextvis(24,25), nextvis(25,26), nextvis(26,27), nextvis(27,28), nextvis(28,29), nextvis(29,30), nextvis(30,31), nextvis(31,32), nextvis(32,33), nextvis(35,36), nextvis(36,37), nextvis(37,38), nextvis(38,39), nextvis(39,40), nextvis(40,41), nextvis(41,42), nextvis(42,43), nextvis(43,44), nextvis(44,45), nextvis(45,46), nextvis(46,47), nextvis(47,48), nextvis(3,6), nextvis(19,20), nextvis(33,34), nextvis(48,49)}