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(15,19), next(16,17), next(17,18), next(19,20), 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(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), next(41,42), next(42,43), doAt(startflow,6), doAt(a22,8), doAt(a7,9), doAt(a1,10), doAt(a2,11), doAt(endflow,12), doAt(endflow,17), doAt(endflow,22), doAt(endflow,28), doAt(endflow,32), doAt(endflow,42), doAt(a17,14), doAt(a11,15), doAt(a10,16), doAt(a8,19), doAt(a9,20), doAt(a21,21), doAt(a15,24), doAt(a5,25), doAt(a16,26), doAt(a6,27), doAt(a25,30), doAt(a20,31), doAt(a3,34), doAt(a13,35), doAt(a23,36), doAt(a19,37), doAt(a12,38), doAt(a4,39), doAt(a14,40), doAt(a18,41), ineffset(startflow,x2), ineffset(startflow,x1), 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(a22,x7), ineffset(a7,x8), ineffset(a1,co2), ineffset(a1,co3), ineffset(a2,x2), ineffset(a2,x21), ineffset(endflow,x19), ineffset(endflow,finished), ineffset(a17,x16), ineffset(a17,x21), ineffset(a11,co22), ineffset(a11,co23), ineffset(a10,x2), ineffset(a10,x19), ineffset(a10,x25), ineffset(a8,x3), ineffset(a9,co18), ineffset(a9,co19), ineffset(a21,x11), ineffset(a15,x3), ineffset(a5,x6), ineffset(a5,x10), ineffset(a5,x14), ineffset(a5,x17), ineffset(a16,co32), ineffset(a16,co33), ineffset(a6,x18), ineffset(a6,x21), ineffset(a6,x23), ineffset(a6,x24), ineffset(a25,co50), ineffset(a25,co51), ineffset(a20,x1), ineffset(a3,x1), ineffset(a3,x18), ineffset(a3,x23), ineffset(a13,x5), ineffset(a13,x9), ineffset(a13,x16), ineffset(a13,x17), ineffset(a23,x5), ineffset(a19,x7), ineffset(a19,x16), ineffset(a12,x5), ineffset(a12,x18), ineffset(a4,x6), ineffset(a4,x8), ineffset(a4,x18), ineffset(a4,x21), ineffset(a14,x5), ineffset(a18,x19), inreadset(a22,x2), inreadset(a22,x15), inreadset(a22,x16), inreadset(a7,x7), inreadset(a1,x3), inreadset(a2,x1), inreadset(a2,x16), inreadset(endflow,x2), inreadset(endflow,x1), 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(a17,x11), inreadset(a17,x16), inreadset(a17,x22), inreadset(a11,x9), inreadset(a11,x11), inreadset(a11,x22), inreadset(a10,x9), inreadset(a8,x19), inreadset(a9,x13), inreadset(a9,x22), inreadset(a9,x23), inreadset(a21,x17), inreadset(a21,x23), inreadset(a15,x17), inreadset(a5,x9), inreadset(a5,x11), inreadset(a5,x20), inreadset(a16,x11), inreadset(a6,x8), inreadset(a25,x4), inreadset(a25,x5), inreadset(a25,x11), inreadset(a20,x17), inreadset(a20,x23), inreadset(a3,x17), inreadset(a3,x21), inreadset(a13,x11), inreadset(a23,x13), inreadset(a19,x4), inreadset(a19,x11), inreadset(a19,x14), inreadset(a12,x6), inreadset(a12,x12), inreadset(a12,x20), inreadset(a4,x11), inreadset(a14,x1), inreadset(a14,x14), inreadset(a14,x18), inreadset(a18,x3), activity(startflow), activity(a22), activity(a7), activity(a1), activity(a2), activity(endflow), activity(a17), activity(a11), activity(a10), activity(a8), activity(a9), activity(a21), activity(a15), activity(a5), activity(a16), activity(a6), activity(a25), activity(a20), activity(a3), activity(a13), activity(a23), activity(a19), activity(a12), activity(a4), activity(a14), activity(a18), effectsObserved(startflow,1), effectsObserved(a22,2), effectsObserved(a7,3), effectsObserved(a1,4), effectsObserved(a2,5), do(startflow,1), do(a22,2), do(a7,3), do(a1,4), do(a2,5), nextvis(1,2), nextvis(2,3), nextvis(3,4), nextvis(4,5), do(a2,11), do(endflow,12), impossible(a,17), impossible(a,22), impossible(a,28), impossible(a,32), impossible(a,42), impossible(a,14), impossible(a,15), impossible(a,16), impossible(a,19), impossible(a,20), impossible(a,21), impossible(a,24), impossible(a,25), impossible(a,26), impossible(a,27), impossible(a,30), impossible(a,31), impossible(a,34), impossible(a,35), impossible(a,36), impossible(a,37), impossible(a,38), impossible(a,39), impossible(a,40), impossible(a,41), impossible(a,18), impossible(a,23), impossible(a,29), impossible(a,33), impossible(a,43), nextvis(11,12), nextvis(5,11), nextvis(12,13)}