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(7,11).
next(11,12).
next(12,13).
next(13,14).
next(14,15).
next(12,16).
next(16,17).
next(17,18).
next(18,19).
next(4,20).
next(20,21).
next(21,22).
next(22,23).
next(23,24).
next(24,25).
next(25,26).
next(26,27).
next(27,28).
next(28,29).
next(29,30).
next(30,31).
next(31,32).
next(29,33).
next(33,34).
next(34,35).
next(35,36).
next(36,37).
next(34,38).
next(38,39).
next(39,40).
next(40,41).
next(26,42).
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(52,53).
next(53,54).
next(51,55).
next(55,56).
next(56,57).
next(57,58).
next(42,59).
next(59,60).
next(60,61).
next(61,62).
next(62,63).
next(63,64).
next(64,65).
next(65,66).
next(66,67).
next(64,68).
next(68,69).
next(69,70).
next(70,71).
next(71,72).
next(69,73).
next(73,74).
next(74,75).
next(75,76).
doAt(startflow,3).
doAt(a12,4).
doAt(a18,5).
doAt(a5,6).
doAt(a21,7).
doAt(a23,8).
doAt(endflow,9).
doAt(a9,11).
doAt(a22,12).
doAt(a14,13).
doAt(endflow,14).
doAt(a13,16).
doAt(a10,17).
doAt(endflow,18).
doAt(a11,20).
doAt(a2,21).
doAt(a15,22).
doAt(a17,23).
doAt(a25,24).
doAt(a4,25).
doAt(a8,26).
doAt(a20,27).
doAt(a5,28).
doAt(a21,29).
doAt(a23,30).
doAt(endflow,31).
doAt(a9,33).
doAt(a22,34).
doAt(a14,35).
doAt(endflow,36).
doAt(a13,38).
doAt(a10,39).
doAt(endflow,40).
doAt(a3,42).
doAt(a16,43).
doAt(a1,44).
doAt(a5,45).
doAt(a21,46).
doAt(a23,47).
doAt(endflow,48).
doAt(a9,50).
doAt(a22,51).
doAt(a14,52).
doAt(endflow,53).
doAt(a13,55).
doAt(a10,56).
doAt(endflow,57).
doAt(a19,59).
doAt(a7,60).
doAt(a6,61).
doAt(a1,62).
doAt(a5,63).
doAt(a21,64).
doAt(a23,65).
doAt(endflow,66).
doAt(a9,68).
doAt(a22,69).
doAt(a14,70).
doAt(endflow,71).
doAt(a13,73).
doAt(a10,74).
doAt(endflow,75).
leftrightnexts(13,16).
leftrightnexts(8,11).
leftrightnexts(35,38).
leftrightnexts(30,33).
leftrightnexts(52,55).
leftrightnexts(47,50).
leftrightnexts(70,73).
leftrightnexts(65,68).
leftrightnexts(43,59).
leftrightnexts(27,42).
leftrightnexts(5,20).