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(20,21).
next(18,22).
next(22,23).
next(23,24).
next(7,25).
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(37,38).
next(35,39).
next(39,40).
next(40,41).
next(25,42).
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(49,53).
next(53,54).
next(54,55).
next(55,56).
next(53,57).
next(57,58).
next(58,59).
next(43,60).
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(71,72).
next(69,73).
next(73,74).
next(74,75).
next(75,76).
next(73,77).
next(77,78).
next(78,79).
doAt(startflow,3).
doAt(a20,5).
doAt(a17,6).
doAt(a19,7).
doAt(a24,8).
doAt(a9,9).
doAt(a11,10).
doAt(a10,11).
doAt(a3,12).
doAt(a14,13).
doAt(a16,14).
doAt(a12,15).
doAt(endflow,16).
doAt(a23,18).
doAt(a18,19).
doAt(endflow,20).
doAt(a13,22).
doAt(endflow,23).
doAt(a22,25).
doAt(a7,26).
doAt(a11,27).
doAt(a10,28).
doAt(a3,29).
doAt(a14,30).
doAt(a16,31).
doAt(a12,32).
doAt(endflow,33).
doAt(a23,35).
doAt(a18,36).
doAt(endflow,37).
doAt(a13,39).
doAt(endflow,40).
doAt(a2,42).
doAt(a5,43).
doAt(a6,44).
doAt(a11,45).
doAt(a10,46).
doAt(a3,47).
doAt(a14,48).
doAt(a16,49).
doAt(a12,50).
doAt(endflow,51).
doAt(a23,53).
doAt(a18,54).
doAt(endflow,55).
doAt(a13,57).
doAt(endflow,58).
doAt(a25,60).
doAt(a15,61).
doAt(a4,62).
doAt(a1,63).
doAt(a8,64).
doAt(a11,65).
doAt(a10,66).
doAt(a3,67).
doAt(a14,68).
doAt(a16,69).
doAt(a12,70).
doAt(endflow,71).
doAt(a23,73).
doAt(a18,74).
doAt(endflow,75).
doAt(a13,77).
doAt(endflow,78).
subsAt(a20,4).
leftrightnexts(19,22).
leftrightnexts(15,18).
leftrightnexts(36,39).
leftrightnexts(32,35).
leftrightnexts(54,57).
leftrightnexts(50,53).
leftrightnexts(74,77).
leftrightnexts(70,73).
leftrightnexts(44,60).
leftrightnexts(26,42).
leftrightnexts(8,25).