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(4,20), next(5,6), next(6,7), next(7,8), next(7,11), next(8,9), next(9,10), next(11,12), next(12,13), next(12,16), next(13,14), next(14,15), next(16,17), 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(26,42), next(27,28), next(28,29), next(29,30), next(29,33), next(30,31), next(31,32), next(33,34), next(34,35), next(34,38), next(35,36), next(36,37), next(38,39), next(39,40), next(40,41), next(42,43), next(42,59), next(43,44), next(44,45), next(45,46), next(46,47), next(46,50), next(47,48), next(48,49), next(50,51), next(51,52), next(51,55), next(52,53), next(53,54), next(55,56), next(56,57), next(57,58), next(59,60), next(60,61), next(61,62), next(62,63), next(63,64), next(64,65), next(64,68), next(65,66), next(66,67), next(68,69), next(69,70), next(69,73), next(70,71), next(71,72), next(73,74), next(74,75), next(75,76), doAt(startflow,3), doAt(a12,4), doAt(a18,5), doAt(a5,6), doAt(a5,28), doAt(a5,45), doAt(a5,63), doAt(a21,7), doAt(a21,29), doAt(a21,46), doAt(a21,64), doAt(a23,8), doAt(a23,30), doAt(a23,47), doAt(a23,65), doAt(endflow,9), doAt(endflow,14), doAt(endflow,18), doAt(endflow,31), doAt(endflow,36), doAt(endflow,40), doAt(endflow,48), doAt(endflow,53), doAt(endflow,57), doAt(endflow,66), doAt(endflow,71), doAt(endflow,75), doAt(a9,11), doAt(a9,33), doAt(a9,50), doAt(a9,68), doAt(a22,12), doAt(a22,34), doAt(a22,51), doAt(a22,69), doAt(a14,13), doAt(a14,35), doAt(a14,52), doAt(a14,70), doAt(a13,16), doAt(a13,38), doAt(a13,55), doAt(a13,73), doAt(a10,17), doAt(a10,39), doAt(a10,56), doAt(a10,74), doAt(a11,20), doAt(a2,21), doAt(a15,22), doAt(a17,23), doAt(a25,24), doAt(a4,25), doAt(a8,26), doAt(a20,27), doAt(a3,42), doAt(a16,43), doAt(a1,44), doAt(a1,62), doAt(a19,59), doAt(a7,60), doAt(a6,61), 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,x19), ineffset(startflow,x20), ineffset(startflow,x21), ineffset(startflow,x22), ineffset(startflow,x23), ineffset(startflow,x24), ineffset(startflow,x25), ineffset(a12,co24), ineffset(a12,co25), ineffset(a18,x5), ineffset(a18,x9), ineffset(a18,x17), ineffset(a18,x22), ineffset(a5,x6), ineffset(a5,x7), ineffset(a5,x9), ineffset(a21,co42), ineffset(a21,co43), ineffset(a23,x11), ineffset(a23,x18), ineffset(a23,x24), ineffset(endflow,x15), ineffset(endflow,x22), ineffset(endflow,x25), ineffset(endflow,finished), ineffset(a9,x11), ineffset(a9,x12), ineffset(a9,x19), ineffset(a22,co44), ineffset(a22,co45), ineffset(a14,x8), ineffset(a14,x11), ineffset(a14,x22), ineffset(a13,x11), ineffset(a10,x13), ineffset(a10,x16), ineffset(a10,x20), ineffset(a10,x24), ineffset(a11,x5), ineffset(a11,x7), ineffset(a11,x9), ineffset(a2,x15), ineffset(a2,x22), ineffset(a15,x7), ineffset(a15,x9), ineffset(a15,x18), ineffset(a15,x19), ineffset(a17,x4), ineffset(a17,x6), ineffset(a17,x7), ineffset(a17,x14), ineffset(a25,x7), ineffset(a25,x13), ineffset(a4,x21), ineffset(a8,co16), ineffset(a8,co17), ineffset(a20,x2), ineffset(a3,co6), ineffset(a3,co7), ineffset(a16,x12), ineffset(a16,x15), ineffset(a16,x19), ineffset(a1,x4), ineffset(a19,x11), ineffset(a19,x16), ineffset(a19,x22), ineffset(a19,x24), ineffset(a7,x3), ineffset(a7,x15), ineffset(a7,x25), ineffset(a6,x12), inreadset(a12,x8), inreadset(a12,x14), inreadset(a18,x21), inreadset(a5,x7), inreadset(a21,x7), inreadset(a21,x10), inreadset(a21,x19), inreadset(a23,x15), inreadset(a23,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,x19), inreadset(endflow,x20), inreadset(endflow,x21), inreadset(endflow,x22), inreadset(endflow,x23), inreadset(endflow,x24), inreadset(endflow,x25), inreadset(a9,x5), inreadset(a9,x23), inreadset(a22,x25), inreadset(a14,x5), inreadset(a14,x22), inreadset(a14,x25), inreadset(a13,x23), inreadset(a10,x4), inreadset(a11,x21), inreadset(a2,x20), inreadset(a15,x18), inreadset(a15,x21), inreadset(a15,x23), inreadset(a17,x16), inreadset(a25,x14), inreadset(a4,x17), inreadset(a8,x3), inreadset(a20,x5), inreadset(a20,x12), inreadset(a20,x17), inreadset(a3,x20), inreadset(a16,x7), inreadset(a1,x5), inreadset(a1,x19), inreadset(a1,x21), inreadset(a19,x19), inreadset(a7,x8), inreadset(a6,x24), activity(startflow), activity(a12), activity(a18), activity(a5), activity(a21), activity(a23), activity(endflow), activity(a9), activity(a22), activity(a14), activity(a13), activity(a10), activity(a11), activity(a2), activity(a15), activity(a17), activity(a25), activity(a4), activity(a8), activity(a20), activity(a3), activity(a16), activity(a1), activity(a19), activity(a7), activity(a6), effectsObserved(startflow,1), effectsObserved(a12,2), do(startflow,1), do(a12,2), nextvis(1,2), do(a18,5), do(a5,6), impossible(a,28), impossible(a,45), impossible(a,63), do(a21,7), impossible(a,29), impossible(a,46), impossible(a,64), do(a23,8), impossible(a,30), impossible(a,47), impossible(a,65), do(endflow,9), do(endflow,14), do(endflow,18), impossible(a,31), impossible(a,36), impossible(a,40), impossible(a,48), impossible(a,53), impossible(a,57), impossible(a,66), impossible(a,71), impossible(a,75), do(a9,11), impossible(a,33), impossible(a,50), impossible(a,68), do(a22,12), impossible(a,34), impossible(a,51), impossible(a,69), do(a14,13), impossible(a,35), impossible(a,52), impossible(a,70), do(a13,16), impossible(a,38), impossible(a,55), impossible(a,73), do(a10,17), impossible(a,39), impossible(a,56), impossible(a,74), impossible(a,20), impossible(a,21), impossible(a,22), impossible(a,23), impossible(a,24), impossible(a,25), impossible(a,26), impossible(a,27), impossible(a,42), impossible(a,43), impossible(a,44), impossible(a,62), impossible(a,59), impossible(a,60), impossible(a,61), impossible(a,32), impossible(a,37), impossible(a,49), impossible(a,41), impossible(a,54), impossible(a,67), impossible(a,58), impossible(a,72), impossible(a,76), nextvis(5,6), nextvis(6,7), nextvis(7,8), nextvis(7,11), nextvis(8,9), nextvis(11,12), nextvis(12,13), nextvis(12,16), nextvis(13,14), nextvis(16,17), nextvis(17,18), nextvis(2,5), nextvis(9,10), nextvis(14,15), nextvis(18,19)}