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(12,16).
next(16,17).
next(17,18).
next(18,19).
next(19,20).
next(17,21).
next(21,22).
next(22,23).
next(23,24).
next(24,25).
next(25,26).
next(26,27).
next(27,28).
next(25,29).
next(29,30).
next(30,31).
next(31,32).
next(29,33).
next(33,34).
next(34,35).
next(7,36).
next(36,37).
next(37,38).
next(38,39).
next(39,40).
next(40,41).
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(46,50).
next(50,51).
next(51,52).
next(52,53).
next(53,54).
next(54,55).
next(55,56).
next(56,57).
next(54,58).
next(58,59).
next(59,60).
next(60,61).
next(58,62).
next(62,63).
next(63,64).
doAt(startflow,3).
doAt(a22,4).
doAt(a10,5).
doAt(a23,6).
doAt(a3,7).
doAt(a7,8).
doAt(a9,9).
doAt(a16,10).
doAt(a1,11).
doAt(a2,12).
doAt(a14,13).
doAt(endflow,14).
doAt(a19,16).
doAt(a25,17).
doAt(a21,18).
doAt(endflow,19).
doAt(a15,21).
doAt(a8,22).
doAt(a20,23).
doAt(a13,24).
doAt(a12,25).
doAt(a4,26).
doAt(endflow,27).
doAt(a17,29).
doAt(a18,30).
doAt(endflow,31).
doAt(a5,33).
doAt(endflow,34).
doAt(a6,36).
doAt(a11,37).
doAt(a9,38).
doAt(a16,39).
doAt(a1,40).
doAt(a2,41).
doAt(a14,42).
doAt(endflow,43).
doAt(a19,45).
doAt(a25,46).
doAt(a21,47).
doAt(endflow,48).
doAt(a15,50).
doAt(a8,51).
doAt(a20,52).
doAt(a13,53).
doAt(a12,54).
doAt(a4,55).
doAt(endflow,56).
doAt(a17,58).
doAt(a18,59).
doAt(endflow,60).
doAt(a5,62).
doAt(endflow,63).
leftrightnexts(30,33).
leftrightnexts(26,29).
leftrightnexts(18,21).
leftrightnexts(13,16).
leftrightnexts(59,62).
leftrightnexts(55,58).
leftrightnexts(47,50).
leftrightnexts(42,45).
leftrightnexts(8,36).