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(11,12).
next(12,13).
next(10,14).
next(14,15).
next(15,16).
next(16,17).
next(17,18).
next(15,19).
next(19,20).
next(20,21).
next(21,22).
next(19,23).
next(23,24).
next(24,25).
next(25,26).
next(26,27).
next(27,28).
next(28,29).
next(29,30).
next(23,31).
next(31,32).
next(32,33).
next(33,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(38,39).
next(39,40).
next(40,41).
next(7,42).
next(42,43).
next(43,44).
next(44,45).
next(45,46).
next(43,47).
next(47,48).
next(48,49).
next(49,50).
next(50,51).
next(48,52).
next(52,53).
next(53,54).
next(54,55).
next(52,56).
next(56,57).
next(57,58).
next(58,59).
next(59,60).
next(60,61).
next(61,62).
next(62,63).
next(56,64).
next(64,65).
next(65,66).
next(66,67).
next(67,68).
next(68,69).
next(69,70).
next(70,71).
next(71,72).
next(72,73).
next(73,74).
doAt(startflow,3).
doAt(a14,5).
doAt(a10,6).
doAt(a7,7).
doAt(a19,8).
doAt(a18,9).
doAt(a9,10).
doAt(a13,11).
doAt(endflow,12).
doAt(a2,14).
doAt(a8,15).
doAt(a17,16).
doAt(endflow,17).
doAt(a23,19).
doAt(a16,20).
doAt(endflow,21).
doAt(a20,23).
doAt(a6,24).
doAt(a21,25).
doAt(a11,26).
doAt(a24,27).
doAt(a25,28).
doAt(endflow,29).
doAt(a12,31).
doAt(a1,32).
doAt(a4,33).
doAt(a5,34).
doAt(a22,35).
doAt(a21,36).
doAt(a11,37).
doAt(a24,38).
doAt(a25,39).
doAt(endflow,40).
doAt(a15,42).
doAt(a9,43).
doAt(a13,44).
doAt(endflow,45).
doAt(a2,47).
doAt(a8,48).
doAt(a17,49).
doAt(endflow,50).
doAt(a23,52).
doAt(a16,53).
doAt(endflow,54).
doAt(a20,56).
doAt(a6,57).
doAt(a21,58).
doAt(a11,59).
doAt(a24,60).
doAt(a25,61).
doAt(endflow,62).
doAt(a12,64).
doAt(a1,65).
doAt(a4,66).
doAt(a5,67).
doAt(a22,68).
doAt(a21,69).
doAt(a11,70).
doAt(a24,71).
doAt(a25,72).
doAt(endflow,73).
subsAt(a14,4).
leftrightnexts(24,31).
leftrightnexts(20,23).
leftrightnexts(16,19).
leftrightnexts(11,14).
leftrightnexts(57,64).
leftrightnexts(53,56).
leftrightnexts(49,52).
leftrightnexts(44,47).
leftrightnexts(8,42).