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(13,14).
next(14,15).
next(15,16).
next(16,17).
next(17,18).
next(18,19).
next(19,20).
next(20,21).
next(18,22).
next(22,23).
next(23,24).
next(17,25).
next(25,26).
next(14,27).
next(27,28).
next(28,29).
next(29,30).
next(30,31).
next(31,32).
next(32,33).
next(30,34).
next(34,35).
next(35,36).
next(29,37).
next(37,38).
next(6,39).
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(50,51).
next(51,52).
next(52,53).
next(53,54).
next(54,55).
next(55,56).
next(56,57).
next(54,58).
next(58,59).
next(59,60).
next(53,61).
next(61,62).
next(50,63).
next(63,64).
next(64,65).
next(65,66).
next(66,67).
next(67,68).
next(68,69).
next(66,70).
next(70,71).
next(71,72).
next(65,73).
next(73,74).
doAt(startflow,3).
doAt(a20,4).
doAt(a5,5).
doAt(a4,6).
doAt(a25,7).
doAt(a21,8).
doAt(a8,9).
doAt(a7,10).
doAt(a6,11).
doAt(a9,12).
doAt(a19,13).
doAt(a16,14).
doAt(a13,15).
doAt(a24,16).
doAt(a23,17).
doAt(a2,18).
doAt(a10,19).
doAt(endflow,20).
doAt(a12,22).
doAt(endflow,23).
doAt(endflow,25).
doAt(a18,27).
doAt(a24,28).
doAt(a23,29).
doAt(a2,30).
doAt(a10,31).
doAt(endflow,32).
doAt(a12,34).
doAt(endflow,35).
doAt(endflow,37).
doAt(a3,39).
doAt(a11,40).
doAt(a14,41).
doAt(a17,42).
doAt(a22,43).
doAt(a1,44).
doAt(a8,45).
doAt(a7,46).
doAt(a6,47).
doAt(a9,48).
doAt(a19,49).
doAt(a16,50).
doAt(a13,51).
doAt(a24,52).
doAt(a23,53).
doAt(a2,54).
doAt(a10,55).
doAt(endflow,56).
doAt(a12,58).
doAt(endflow,59).
doAt(endflow,61).
doAt(a18,63).
doAt(a24,64).
doAt(a23,65).
doAt(a2,66).
doAt(a10,67).
doAt(endflow,68).
doAt(a12,70).
doAt(endflow,71).
doAt(endflow,73).
leftrightnexts(19,22).
leftrightnexts(18,25).
leftrightnexts(31,34).
leftrightnexts(30,37).
leftrightnexts(15,27).
leftrightnexts(55,58).
leftrightnexts(54,61).
leftrightnexts(67,70).
leftrightnexts(66,73).
leftrightnexts(51,63).
leftrightnexts(7,39).