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(8,21).
next(21,22).
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(28,32).
next(32,33).
next(33,34).
next(27,35).
next(35,36).
next(36,37).
next(25,38).
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(43,51).
next(51,52).
next(52,53).
next(41,54).
next(54,55).
next(55,56).
next(56,57).
next(57,58).
next(58,59).
next(59,60).
next(57,61).
next(61,62).
next(62,63).
next(56,64).
next(64,65).
next(65,66).
doAt(startflow,3).
doAt(a9,4).
doAt(a13,5).
doAt(a23,6).
doAt(a22,7).
doAt(a4,8).
doAt(a24,9).
doAt(a14,10).
doAt(a3,11).
doAt(a8,12).
doAt(endflow,13).
doAt(a25,15).
doAt(endflow,16).
doAt(a2,18).
doAt(endflow,19).
doAt(a7,21).
doAt(a1,22).
doAt(a17,23).
doAt(a15,24).
doAt(a21,25).
doAt(a5,26).
doAt(a14,27).
doAt(a3,28).
doAt(a8,29).
doAt(endflow,30).
doAt(a25,32).
doAt(endflow,33).
doAt(a2,35).
doAt(endflow,36).
doAt(a20,38).
doAt(a19,39).
doAt(a10,40).
doAt(a6,41).
doAt(a12,42).
doAt(a14,43).
doAt(a3,44).
doAt(a8,45).
doAt(endflow,46).
doAt(a25,48).
doAt(endflow,49).
doAt(a2,51).
doAt(endflow,52).
doAt(a16,54).
doAt(a18,55).
doAt(a14,56).
doAt(a3,57).
doAt(a8,58).
doAt(endflow,59).
doAt(a25,61).
doAt(endflow,62).
doAt(a2,64).
doAt(endflow,65).
leftrightnexts(12,15).
leftrightnexts(11,18).
leftrightnexts(29,32).
leftrightnexts(28,35).
leftrightnexts(45,48).
leftrightnexts(44,51).
leftrightnexts(58,61).
leftrightnexts(57,64).
leftrightnexts(42,54).
leftrightnexts(26,38).
leftrightnexts(9,21).