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(6,12).
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(17,22).
next(22,23).
next(23,24).
next(24,25).
next(25,26).
next(26,27).
next(23,28).
next(28,29).
next(29,30).
next(30,31).
next(31,32).
next(32,33).
next(29,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(38,39).
next(15,40).
next(40,41).
next(41,42).
next(42,43).
next(43,44).
next(44,45).
next(45,46).
next(42,47).
next(47,48).
next(48,49).
next(49,50).
next(50,51).
next(51,52).
next(48,53).
next(53,54).
next(54,55).
next(55,56).
next(56,57).
next(57,58).
next(54,59).
next(59,60).
next(60,61).
next(61,62).
next(62,63).
next(63,64).
doAt(startflow,3).
doAt(a22,4).
doAt(a4,5).
doAt(a14,6).
doAt(a8,7).
doAt(a11,8).
doAt(a3,9).
doAt(endflow,10).
doAt(a24,12).
doAt(a20,13).
doAt(a1,14).
doAt(a19,15).
doAt(a2,16).
doAt(a23,17).
doAt(a7,18).
doAt(a3,19).
doAt(endflow,20).
doAt(a9,22).
doAt(a18,23).
doAt(a21,24).
doAt(a3,25).
doAt(endflow,26).
doAt(a15,28).
doAt(a10,29).
doAt(a13,30).
doAt(a3,31).
doAt(endflow,32).
doAt(a25,34).
doAt(a6,35).
doAt(a16,36).
doAt(a3,37).
doAt(endflow,38).
doAt(a5,40).
doAt(a12,41).
doAt(a23,42).
doAt(a7,43).
doAt(a3,44).
doAt(endflow,45).
doAt(a9,47).
doAt(a18,48).
doAt(a21,49).
doAt(a3,50).
doAt(endflow,51).
doAt(a15,53).
doAt(a10,54).
doAt(a13,55).
doAt(a3,56).
doAt(endflow,57).
doAt(a25,59).
doAt(a6,60).
doAt(a16,61).
doAt(a3,62).
doAt(endflow,63).
leftrightnexts(30,34).
leftrightnexts(24,28).
leftrightnexts(18,22).
leftrightnexts(55,59).
leftrightnexts(49,53).
leftrightnexts(43,47).
leftrightnexts(16,40).
leftrightnexts(7,12).