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(11,15).
next(15,16).
next(16,17).
next(10,18).
next(18,19).
next(19,20).
next(20,21).
next(7,22).
next(22,23).
next(23,24).
next(24,25).
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(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(43,44).
next(44,45).
next(28,46).
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(60,61).
next(61,62).
doAt(startflow,4).
doAt(a25,5).
doAt(a22,6).
doAt(a13,7).
doAt(a16,8).
doAt(a11,9).
doAt(a23,10).
doAt(a14,11).
doAt(a9,12).
doAt(endflow,13).
doAt(a7,15).
doAt(endflow,16).
doAt(a19,18).
doAt(a3,19).
doAt(endflow,20).
doAt(a24,22).
doAt(a15,23).
doAt(a4,24).
doAt(a6,25).
doAt(a17,26).
doAt(a21,27).
doAt(a12,28).
doAt(a18,29).
doAt(a1,30).
doAt(a10,31).
doAt(a2,32).
doAt(a5,33).
doAt(a23,34).
doAt(a14,35).
doAt(a9,36).
doAt(endflow,37).
doAt(a7,39).
doAt(endflow,40).
doAt(a19,42).
doAt(a3,43).
doAt(endflow,44).
doAt(a8,46).
doAt(a1,47).
doAt(a10,48).
doAt(a2,49).
doAt(a5,50).
doAt(a23,51).
doAt(a14,52).
doAt(a9,53).
doAt(endflow,54).
doAt(a7,56).
doAt(endflow,57).
doAt(a19,59).
doAt(a3,60).
doAt(endflow,61).
leftrightnexts(12,15).
leftrightnexts(11,18).
leftrightnexts(36,39).
leftrightnexts(35,42).
leftrightnexts(53,56).
leftrightnexts(52,59).
leftrightnexts(29,46).
leftrightnexts(8,22).