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(14,18).
next(18,19).
next(19,20).
next(9,21).
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(32,33).
next(33,34).
next(31,35).
next(35,36).
next(36,37).
next(21,38).
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(49,50).
next(50,51).
next(51,52).
next(52,53).
next(53,54).
next(51,55).
next(55,56).
next(56,57).
next(40,58).
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(66,67).
next(67,68).
next(68,69).
next(69,70).
next(70,71).
next(68,72).
next(72,73).
next(73,74).
doAt(startflow,5).
doAt(a17,7).
doAt(a13,8).
doAt(a5,9).
doAt(a8,10).
doAt(a6,11).
doAt(a9,12).
doAt(a7,13).
doAt(a14,14).
doAt(a22,15).
doAt(endflow,16).
doAt(a12,18).
doAt(endflow,19).
doAt(a18,21).
doAt(a16,22).
doAt(a24,23).
doAt(a2,24).
doAt(a19,25).
doAt(a21,26).
doAt(a20,27).
doAt(a4,28).
doAt(a9,29).
doAt(a7,30).
doAt(a14,31).
doAt(a22,32).
doAt(endflow,33).
doAt(a12,35).
doAt(endflow,36).
doAt(a10,38).
doAt(a25,39).
doAt(a15,40).
doAt(a11,41).
doAt(a1,42).
doAt(a24,43).
doAt(a2,44).
doAt(a19,45).
doAt(a21,46).
doAt(a20,47).
doAt(a4,48).
doAt(a9,49).
doAt(a7,50).
doAt(a14,51).
doAt(a22,52).
doAt(endflow,53).
doAt(a12,55).
doAt(endflow,56).
doAt(a3,58).
doAt(a1,59).
doAt(a24,60).
doAt(a2,61).
doAt(a19,62).
doAt(a21,63).
doAt(a20,64).
doAt(a4,65).
doAt(a9,66).
doAt(a7,67).
doAt(a14,68).
doAt(a22,69).
doAt(endflow,70).
doAt(a12,72).
doAt(endflow,73).
subsAt(a17,6).
leftrightnexts(15,18).
leftrightnexts(32,35).
leftrightnexts(52,55).
leftrightnexts(69,72).
leftrightnexts(41,58).
leftrightnexts(22,38).
leftrightnexts(10,21).