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(15,16).
next(16,17).
next(14,18).
next(18,19).
next(19,20).
next(5,21).
next(21,22).
next(22,23).
next(23,24).
next(24,25).
next(22,26).
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(4,36).
next(36,37).
next(37,38).
next(38,39).
next(39,40).
next(40,41).
next(41,42).
next(42,43).
next(40,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(48,49).
next(49,50).
next(47,51).
next(51,52).
next(52,53).
next(38,54).
next(54,55).
next(55,56).
next(56,57).
next(57,58).
next(58,59).
next(59,60).
next(60,61).
next(61,62).
next(62,63).
next(63,64).
next(64,65).
next(62,66).
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).
doAt(startflow,3).
doAt(a14,4).
doAt(a4,5).
doAt(a5,6).
doAt(a11,7).
doAt(a2,8).
doAt(endflow,9).
doAt(a21,11).
doAt(a16,12).
doAt(a17,13).
doAt(a23,14).
doAt(a19,15).
doAt(endflow,16).
doAt(a3,18).
doAt(endflow,19).
doAt(a7,21).
doAt(a11,22).
doAt(a2,23).
doAt(endflow,24).
doAt(a21,26).
doAt(a16,27).
doAt(a17,28).
doAt(a23,29).
doAt(a19,30).
doAt(endflow,31).
doAt(a3,33).
doAt(endflow,34).
doAt(a25,36).
doAt(a1,37).
doAt(a18,38).
doAt(a9,39).
doAt(a11,40).
doAt(a2,41).
doAt(endflow,42).
doAt(a21,44).
doAt(a16,45).
doAt(a17,46).
doAt(a23,47).
doAt(a19,48).
doAt(endflow,49).
doAt(a3,51).
doAt(endflow,52).
doAt(a13,54).
doAt(a24,55).
doAt(a8,56).
doAt(a15,57).
doAt(a6,58).
doAt(a20,59).
doAt(a10,60).
doAt(a12,61).
doAt(a11,62).
doAt(a2,63).
doAt(endflow,64).
doAt(a21,66).
doAt(a16,67).
doAt(a17,68).
doAt(a23,69).
doAt(a19,70).
doAt(endflow,71).
doAt(a3,73).
doAt(endflow,74).
leftrightnexts(15,18).
leftrightnexts(8,11).
leftrightnexts(30,33).
leftrightnexts(23,26).
leftrightnexts(6,21).
leftrightnexts(48,51).
leftrightnexts(41,44).
leftrightnexts(70,73).
leftrightnexts(63,66).
leftrightnexts(39,54).
leftrightnexts(5,36).