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(17,21).
next(21,22).
next(22,23).
next(16,24).
next(24,25).
next(13,26).
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(34,35).
next(35,36).
next(36,37).
next(37,38).
next(35,39).
next(39,40).
next(40,41).
next(34,42).
next(42,43).
next(8,44).
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(52,56).
next(56,57).
next(57,58).
next(51,59).
next(59,60).
next(48,61).
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(72,73).
next(70,74).
next(74,75).
next(75,76).
next(69,77).
next(77,78).
doAt(startflow,4).
doAt(a13,5).
doAt(a2,6).
doAt(a15,7).
doAt(a20,8).
doAt(a8,9).
doAt(a7,10).
doAt(a25,11).
doAt(a11,12).
doAt(a10,13).
doAt(a16,14).
doAt(a3,15).
doAt(a1,16).
doAt(a14,17).
doAt(a18,18).
doAt(endflow,19).
doAt(a24,21).
doAt(endflow,22).
doAt(endflow,24).
doAt(a12,26).
doAt(a5,27).
doAt(a21,28).
doAt(a6,29).
doAt(a19,30).
doAt(a22,31).
doAt(a9,32).
doAt(a3,33).
doAt(a1,34).
doAt(a14,35).
doAt(a18,36).
doAt(endflow,37).
doAt(a24,39).
doAt(endflow,40).
doAt(endflow,42).
doAt(a17,44).
doAt(a4,45).
doAt(a25,46).
doAt(a11,47).
doAt(a10,48).
doAt(a16,49).
doAt(a3,50).
doAt(a1,51).
doAt(a14,52).
doAt(a18,53).
doAt(endflow,54).
doAt(a24,56).
doAt(endflow,57).
doAt(endflow,59).
doAt(a12,61).
doAt(a5,62).
doAt(a21,63).
doAt(a6,64).
doAt(a19,65).
doAt(a22,66).
doAt(a9,67).
doAt(a3,68).
doAt(a1,69).
doAt(a14,70).
doAt(a18,71).
doAt(endflow,72).
doAt(a24,74).
doAt(endflow,75).
doAt(endflow,77).
leftrightnexts(18,21).
leftrightnexts(17,24).
leftrightnexts(36,39).
leftrightnexts(35,42).
leftrightnexts(14,26).
leftrightnexts(53,56).
leftrightnexts(52,59).
leftrightnexts(71,74).
leftrightnexts(70,77).
leftrightnexts(49,61).
leftrightnexts(9,44).