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(15,19).
next(19,20).
next(20,21).
next(21,22).
next(19,23).
next(23,24).
next(24,25).
next(25,26).
next(26,27).
next(27,28).
next(12,29).
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(38,39).
next(39,40).
next(37,41).
next(41,42).
next(42,43).
next(43,44).
next(41,45).
next(45,46).
next(46,47).
next(47,48).
next(48,49).
next(49,50).
next(29,51).
next(51,52).
next(52,53).
next(53,54).
next(54,55).
next(55,56).
next(56,57).
next(57,58).
next(58,59).
next(59,60).
next(60,61).
next(58,62).
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).
doAt(startflow,6).
doAt(a4,7).
doAt(a16,8).
doAt(a19,9).
doAt(a10,10).
doAt(a12,11).
doAt(a9,12).
doAt(a13,13).
doAt(a22,14).
doAt(a21,15).
doAt(a14,16).
doAt(endflow,17).
doAt(a24,19).
doAt(a6,20).
doAt(endflow,21).
doAt(a5,23).
doAt(a7,24).
doAt(a20,25).
doAt(a18,26).
doAt(endflow,27).
doAt(a1,29).
doAt(a25,30).
doAt(a23,31).
doAt(a2,32).
doAt(a3,33).
doAt(a11,34).
doAt(a15,35).
doAt(a22,36).
doAt(a21,37).
doAt(a14,38).
doAt(endflow,39).
doAt(a24,41).
doAt(a6,42).
doAt(endflow,43).
doAt(a5,45).
doAt(a7,46).
doAt(a20,47).
doAt(a18,48).
doAt(endflow,49).
doAt(a17,51).
doAt(a23,52).
doAt(a2,53).
doAt(a3,54).
doAt(a11,55).
doAt(a15,56).
doAt(a22,57).
doAt(a21,58).
doAt(a14,59).
doAt(endflow,60).
doAt(a24,62).
doAt(a6,63).
doAt(endflow,64).
doAt(a5,66).
doAt(a7,67).
doAt(a20,68).
doAt(a18,69).
doAt(endflow,70).
leftrightnexts(20,23).
leftrightnexts(16,19).
leftrightnexts(42,45).
leftrightnexts(38,41).
leftrightnexts(63,66).
leftrightnexts(59,62).
leftrightnexts(30,51).
leftrightnexts(13,29).