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(8,14).
next(14,15).
next(15,16).
next(16,17).
next(17,18).
next(18,19).
next(19,20).
next(20,21).
next(21,22).
next(22,23).
next(23,24).
next(24,25).
next(25,26).
next(21,27).
next(27,28).
next(28,29).
next(29,30).
next(30,31).
next(31,32).
next(27,33).
next(33,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(38,39).
next(17,40).
next(40,41).
next(41,42).
next(42,43).
next(43,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(48,49).
next(44,50).
next(50,51).
next(51,52).
next(52,53).
next(53,54).
next(54,55).
next(50,56).
next(56,57).
next(57,58).
next(58,59).
next(59,60).
next(60,61).
next(61,62).
doAt(startflow,3).
doAt(a1,4).
doAt(a14,5).
doAt(a21,6).
doAt(a24,7).
doAt(a7,8).
doAt(a4,9).
doAt(a17,10).
doAt(a5,11).
doAt(endflow,12).
doAt(a15,14).
doAt(a16,15).
doAt(a12,16).
doAt(a18,17).
doAt(a8,18).
doAt(a19,19).
doAt(a10,20).
doAt(a20,21).
doAt(a25,22).
doAt(a17,23).
doAt(a5,24).
doAt(endflow,25).
doAt(a23,27).
doAt(a9,28).
doAt(a17,29).
doAt(a5,30).
doAt(endflow,31).
doAt(a2,33).
doAt(a11,34).
doAt(a13,35).
doAt(a17,36).
doAt(a5,37).
doAt(endflow,38).
doAt(a22,40).
doAt(a6,41).
doAt(a19,42).
doAt(a10,43).
doAt(a20,44).
doAt(a25,45).
doAt(a17,46).
doAt(a5,47).
doAt(endflow,48).
doAt(a23,50).
doAt(a9,51).
doAt(a17,52).
doAt(a5,53).
doAt(endflow,54).
doAt(a2,56).
doAt(a11,57).
doAt(a13,58).
doAt(a17,59).
doAt(a5,60).
doAt(endflow,61).
leftrightnexts(28,33).
leftrightnexts(22,27).
leftrightnexts(51,56).
leftrightnexts(45,50).
leftrightnexts(18,40).
leftrightnexts(9,14).