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(4,19), next(5,6), next(6,7), next(7,8), next(8,9), next(8,16), next(9,10), next(9,13), next(10,11), next(11,12), next(13,14), next(14,15), next(16,17), next(17,18), next(19,20), next(20,21), next(21,22), next(22,23), next(22,37), next(23,24), next(24,25), next(25,26), next(26,27), next(26,34), next(27,28), next(27,31), next(28,29), next(29,30), next(31,32), next(32,33), next(34,35), next(35,36), 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(49,50), next(49,57), next(50,51), next(50,54), next(51,52), next(52,53), next(54,55), next(55,56), next(57,58), next(58,59), doAt(startflow,3), doAt(a21,4), doAt(a13,5), doAt(a6,6), doAt(a6,24), doAt(a6,47), doAt(a17,7), doAt(a17,25), doAt(a17,48), doAt(a1,8), doAt(a1,26), doAt(a1,49), doAt(a19,9), doAt(a19,27), doAt(a19,50), doAt(a9,10), doAt(a9,28), doAt(a9,51), doAt(endflow,11), doAt(endflow,14), doAt(endflow,17), doAt(endflow,29), doAt(endflow,32), doAt(endflow,35), doAt(endflow,52), doAt(endflow,55), doAt(endflow,58), doAt(a7,13), doAt(a7,31), doAt(a7,54), doAt(a8,16), doAt(a8,34), doAt(a8,57), doAt(a16,19), doAt(a14,20), doAt(a23,21), doAt(a2,22), doAt(a24,23), doAt(a22,37), doAt(a25,38), doAt(a11,39), doAt(a10,40), doAt(a5,41), doAt(a4,42), doAt(a18,43), doAt(a12,44), doAt(a20,45), doAt(a15,46), 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(a21,co42), ineffset(a21,co43), ineffset(a13,x17), ineffset(a6,x3), ineffset(a6,x4), ineffset(a6,x7), ineffset(a6,x16), ineffset(a17,x14), ineffset(a1,co2), ineffset(a1,co3), ineffset(a19,co38), ineffset(a19,co39), ineffset(a9,x2), ineffset(a9,x22), ineffset(a9,x24), ineffset(endflow,x5), ineffset(endflow,x7), ineffset(endflow,x16), ineffset(endflow,x18), ineffset(endflow,finished), ineffset(a8,x12), ineffset(a8,x14), ineffset(a16,x18), ineffset(a16,x22), ineffset(a14,x8), ineffset(a14,x11), ineffset(a14,x17), ineffset(a23,x6), ineffset(a23,x23), ineffset(a23,x24), ineffset(a23,x25), ineffset(a2,co4), ineffset(a2,co5), ineffset(a24,x5), ineffset(a24,x9), ineffset(a22,x24), ineffset(a25,x4), ineffset(a11,x9), ineffset(a11,x23), ineffset(a11,x25), ineffset(a10,x2), ineffset(a5,x3), ineffset(a5,x8), ineffset(a5,x14), ineffset(a5,x25), ineffset(a4,x4), ineffset(a4,x15), ineffset(a4,x25), ineffset(a18,x14), ineffset(a18,x20), ineffset(a18,x23), ineffset(a12,x7), ineffset(a20,x6), ineffset(a20,x14), ineffset(a20,x16), ineffset(a15,x1), ineffset(a15,x6), ineffset(a15,x7), ineffset(a15,x8), inreadset(a21,x21), inreadset(a13,x19), inreadset(a6,x4), inreadset(a6,x15), inreadset(a6,x21), inreadset(a17,x2), inreadset(a17,x4), inreadset(a17,x8), inreadset(a1,x5), inreadset(a19,x1), inreadset(a19,x22), inreadset(a9,x20), 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(a7,x20), inreadset(a8,x21), inreadset(a16,x9), inreadset(a16,x24), inreadset(a14,x8), inreadset(a14,x13), inreadset(a23,x2), inreadset(a2,x19), inreadset(a24,x10), inreadset(a22,x23), inreadset(a22,x25), inreadset(a25,x24), inreadset(a11,x14), inreadset(a10,x18), inreadset(a5,x12), inreadset(a5,x15), inreadset(a4,x14), inreadset(a4,x19), inreadset(a18,x10), inreadset(a12,x11), inreadset(a12,x14), inreadset(a12,x24), inreadset(a20,x12), inreadset(a15,x16), inreadset(a15,x24), activity(startflow), activity(a21), activity(a13), activity(a6), activity(a17), activity(a1), activity(a19), activity(a9), activity(endflow), activity(a7), activity(a8), activity(a16), activity(a14), activity(a23), activity(a2), activity(a24), activity(a22), activity(a25), activity(a11), activity(a10), activity(a5), activity(a4), activity(a18), activity(a12), activity(a20), activity(a15), effectsObserved(startflow,1), effectsObserved(a21,2), do(startflow,1), do(a21,2), nextvis(1,2), do(a13,5), do(a6,6), impossible(a,24), impossible(a,47), do(a17,7), impossible(a,25), impossible(a,48), do(a1,8), impossible(a,26), impossible(a,49), do(a19,9), impossible(a,27), impossible(a,50), do(a9,10), impossible(a,28), impossible(a,51), do(endflow,11), do(endflow,14), do(endflow,17), impossible(a,29), impossible(a,32), impossible(a,35), impossible(a,52), impossible(a,55), impossible(a,58), impossible(a,31), impossible(a,54), do(a8,16), impossible(a,34), impossible(a,57), impossible(a,19), impossible(a,20), impossible(a,21), impossible(a,22), impossible(a,23), impossible(a,37), impossible(a,38), impossible(a,39), impossible(a,40), impossible(a,41), impossible(a,42), impossible(a,43), impossible(a,44), impossible(a,45), impossible(a,46), impossible(a,36), impossible(a,30), impossible(a,33), impossible(a,59), impossible(a,53), impossible(a,56), nextvis(5,6), nextvis(6,7), nextvis(7,8), nextvis(8,9), nextvis(8,16), nextvis(9,10), nextvis(10,11), nextvis(16,17), nextvis(2,5), nextvis(9,14), nextvis(11,12), nextvis(14,15), nextvis(17,18)}