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(11,15).
next(15,16).
next(16,17).
next(10,18).
next(18,19).
next(19,20).
next(20,21).
next(21,22).
next(7,23).
next(23,24).
next(24,25).
next(25,26).
next(26,27).
next(27,28).
next(28,29).
next(26,30).
next(30,31).
next(31,32).
next(25,33).
next(33,34).
next(34,35).
next(35,36).
next(36,37).
next(23,38).
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(46,50).
next(50,51).
next(51,52).
next(45,53).
next(53,54).
next(54,55).
next(55,56).
next(56,57).
next(43,58).
next(58,59).
next(59,60).
next(60,61).
next(61,62).
next(62,63).
next(63,64).
next(64,65).
next(65,66).
next(63,67).
next(67,68).
next(68,69).
next(62,70).
next(70,71).
next(71,72).
next(72,73).
next(73,74).
doAt(startflow,4).
doAt(a25,6).
doAt(a7,7).
doAt(a22,8).
doAt(a3,9).
doAt(a23,10).
doAt(a24,11).
doAt(a14,12).
doAt(endflow,13).
doAt(a9,15).
doAt(endflow,16).
doAt(a11,18).
doAt(a8,19).
doAt(a16,20).
doAt(endflow,21).
doAt(a2,23).
doAt(a20,24).
doAt(a23,25).
doAt(a24,26).
doAt(a14,27).
doAt(endflow,28).
doAt(a9,30).
doAt(endflow,31).
doAt(a11,33).
doAt(a8,34).
doAt(a16,35).
doAt(endflow,36).
doAt(a15,38).
doAt(a17,39).
doAt(a5,40).
doAt(a13,41).
doAt(a18,42).
doAt(a10,43).
doAt(a6,44).
doAt(a23,45).
doAt(a24,46).
doAt(a14,47).
doAt(endflow,48).
doAt(a9,50).
doAt(endflow,51).
doAt(a11,53).
doAt(a8,54).
doAt(a16,55).
doAt(endflow,56).
doAt(a21,58).
doAt(a19,59).
doAt(a12,60).
doAt(a1,61).
doAt(a23,62).
doAt(a24,63).
doAt(a14,64).
doAt(endflow,65).
doAt(a9,67).
doAt(endflow,68).
doAt(a11,70).
doAt(a8,71).
doAt(a16,72).
doAt(endflow,73).
subsAt(a25,5).
leftrightnexts(12,15).
leftrightnexts(11,18).
leftrightnexts(27,30).
leftrightnexts(26,33).
leftrightnexts(47,50).
leftrightnexts(46,53).
leftrightnexts(64,67).
leftrightnexts(63,70).
leftrightnexts(44,58).
leftrightnexts(24,38).
leftrightnexts(8,23).