next(1,2).
next(2,3).
next(3,4).
next(4,5).
next(5,6).
next(6,7).
next(7,8).
next(4,9).
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(20,21).
next(18,22).
next(22,23).
next(23,24).
next(24,25).
next(25,26).
next(23,27).
next(27,28).
next(28,29).
next(29,30).
next(30,31).
next(31,32).
next(32,33).
next(33,34).
next(22,35).
next(35,36).
next(10,37).
next(37,38).
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(44,48).
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(56,57).
next(57,58).
next(58,59).
next(59,60).
next(48,61).
next(61,62).
doAt(startflow,3).
doAt(a8,4).
doAt(a25,5).
doAt(a18,6).
doAt(endflow,7).
doAt(a17,9).
doAt(a4,10).
doAt(a24,11).
doAt(a22,12).
doAt(a15,13).
doAt(a10,14).
doAt(a23,15).
doAt(a20,16).
doAt(a16,17).
doAt(a3,18).
doAt(a21,19).
doAt(endflow,20).
doAt(a5,22).
doAt(a14,23).
doAt(a6,24).
doAt(endflow,25).
doAt(a7,27).
doAt(a19,28).
doAt(a2,29).
doAt(a1,30).
doAt(a9,31).
doAt(a13,32).
doAt(endflow,33).
doAt(endflow,35).
doAt(a11,37).
doAt(a22,38).
doAt(a15,39).
doAt(a10,40).
doAt(a23,41).
doAt(a20,42).
doAt(a16,43).
doAt(a3,44).
doAt(a21,45).
doAt(endflow,46).
doAt(a5,48).
doAt(a14,49).
doAt(a6,50).
doAt(endflow,51).
doAt(a7,53).
doAt(a19,54).
doAt(a2,55).
doAt(a1,56).
doAt(a9,57).
doAt(a13,58).
doAt(endflow,59).
doAt(endflow,61).
leftrightnexts(24,27).
leftrightnexts(23,35).
leftrightnexts(19,22).
leftrightnexts(50,53).
leftrightnexts(49,61).
leftrightnexts(45,48).
leftrightnexts(11,37).
leftrightnexts(5,9).