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(10,73), next(11,12), next(12,13), next(12,31), next(13,14), next(14,15), next(15,16), next(16,17), next(16,21), next(17,18), next(18,19), next(19,20), next(21,22), next(22,23), next(22,27), next(23,24), next(24,25), next(25,26), next(27,28), next(28,29), next(29,30), next(31,32), next(32,33), next(33,34), next(34,35), next(35,36), next(35,54), next(36,37), next(37,38), next(38,39), next(39,40), next(39,44), next(40,41), next(41,42), next(42,43), next(44,45), next(45,46), next(45,50), next(46,47), next(47,48), next(48,49), next(50,51), next(51,52), next(52,53), next(54,55), next(55,56), next(56,57), next(57,58), next(58,59), next(58,63), next(59,60), next(60,61), next(61,62), next(63,64), next(64,65), next(64,69), next(65,66), next(66,67), next(67,68), next(69,70), next(70,71), next(71,72), next(73,74), next(74,75), next(74,99), 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inreadset(endflow,x24), inreadset(endflow,x25), inreadset(a13,x21), inreadset(a24,x5), inreadset(a24,x8), inreadset(a7,x13), inreadset(a7,x2), inreadset(a7,x5), inreadset(a25,x15), inreadset(a25,x18), inreadset(a18,x5), inreadset(a4,x8), inreadset(a2,x11), inreadset(a2,x16), inreadset(a21,x11), inreadset(a21,x16), inreadset(a21,x24), inreadset(a10,x23), inreadset(a10,x19), inreadset(a11,x13), inreadset(a17,x7), inreadset(a17,x16), inreadset(a17,x24), inreadset(a3,x7), inreadset(a3,x9), inreadset(a3,x12), inreadset(a12,x1), inreadset(a12,x5), inreadset(a12,x12), inreadset(a6,x11), activity(startflow), activity(a19), activity(a8), activity(a9), activity(a5), activity(a20), activity(a16), activity(a23), activity(a1), activity(a22), activity(a14), activity(endflow), activity(a13), activity(a24), activity(a7), activity(a25), activity(a18), activity(a4), activity(a2), activity(a21), activity(a10), activity(a11), activity(a17), activity(a3), activity(a12), activity(a6), effectsObserved(startflow,1), effectsObserved(a19,2), effectsObserved(a8,3), effectsObserved(a9,4), effectsObserved(a5,5), effectsObserved(a23,6), do(startflow,1), do(a19,2), do(a8,3), do(a9,4), do(a5,5), do(a23,6), nextvis(1,2), nextvis(2,3), nextvis(3,4), nextvis(4,5), nextvis(5,6), subs(a19,8), do(a19,9), impossible(a,74), do(a20,13), impossible(a,75), do(a16,14), impossible(a,76), do(a23,15), impossible(a,38), impossible(a,57), impossible(a,77), impossible(a,106), impossible(a,128), do(a1,16), impossible(a,39), impossible(a,58), impossible(a,78), impossible(a,107), impossible(a,129), do(a22,17), impossible(a,40), impossible(a,59), impossible(a,79), impossible(a,108), impossible(a,130), do(a14,18), do(a14,24), do(a14,28), impossible(a,41), impossible(a,47), impossible(a,51), impossible(a,60), impossible(a,66), impossible(a,70), impossible(a,80), impossible(a,89), impossible(a,94), impossible(a,109), impossible(a,117), impossible(a,121), impossible(a,131), impossible(a,139), impossible(a,143), do(endflow,19), do(endflow,25), do(endflow,29), impossible(a,42), impossible(a,48), impossible(a,52), impossible(a,61), impossible(a,67), impossible(a,71), impossible(a,83), impossible(a,91), impossible(a,97), impossible(a,111), impossible(a,118), impossible(a,123), impossible(a,133), impossible(a,140), impossible(a,145), do(a13,21), impossible(a,44), impossible(a,63), impossible(a,85), impossible(a,113), impossible(a,135), do(a24,22), impossible(a,45), impossible(a,64), impossible(a,86), impossible(a,114), impossible(a,136), do(a7,23), impossible(a,46), impossible(a,65), impossible(a,88), impossible(a,116), impossible(a,138), do(a25,27), impossible(a,50), impossible(a,69), impossible(a,93), impossible(a,120), impossible(a,142), impossible(a,31), impossible(a,99), impossible(a,32), impossible(a,100), impossible(a,33), impossible(a,101), impossible(a,34), impossible(a,102), impossible(a,35), impossible(a,103), impossible(a,37), impossible(a,105), impossible(a,54), impossible(a,125), impossible(a,55), impossible(a,126), impossible(a,56), impossible(a,127), impossible(a,73), impossible(a,81), impossible(a,87), impossible(a,95), impossible(a,110), impossible(a,115), impossible(a,122), impossible(a,132), impossible(a,137), impossible(a,144), impossible(a,82), impossible(a,90), impossible(a,96), impossible(a,36), impossible(a,104), impossible(a,84), impossible(a,43), impossible(a,62), impossible(a,92), impossible(a,98), impossible(a,112), impossible(a,49), impossible(a,53), impossible(a,134), impossible(a,68), impossible(a,72), impossible(a,119), impossible(a,124), impossible(a,141), impossible(a,146), nextvis(8,9), nextvis(13,14), nextvis(14,15), nextvis(15,16), nextvis(16,17), nextvis(16,21), nextvis(17,18), nextvis(18,19), nextvis(21,22), nextvis(22,23), nextvis(22,27), nextvis(23,24), nextvis(24,25), nextvis(27,28), nextvis(28,29), nextvis(6,8), nextvis(9,13), nextvis(19,20), nextvis(25,26), nextvis(29,30)}