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(16,20).
next(20,21).
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(26,30).
next(30,31).
next(31,32).
next(32,33).
next(11,34).
next(34,35).
next(35,36).
next(5,37).
next(37,38).
next(38,39).
next(39,40).
next(40,41).
next(41,42).
next(42,43).
next(43,44).
next(44,45).
next(42,46).
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(57,58).
next(58,59).
next(56,60).
next(60,61).
next(61,62).
next(62,63).
next(41,64).
next(64,65).
next(65,66).
doAt(startflow,3).
doAt(a7,4).
doAt(a6,5).
doAt(a16,6).
doAt(a24,7).
doAt(a13,8).
doAt(a4,9).
doAt(a3,10).
doAt(a8,11).
doAt(a2,12).
doAt(a25,13).
doAt(endflow,14).
doAt(a17,16).
doAt(a14,17).
doAt(endflow,18).
doAt(a19,20).
doAt(a12,21).
doAt(a18,22).
doAt(a9,23).
doAt(a15,24).
doAt(a10,25).
doAt(a20,26).
doAt(a23,27).
doAt(endflow,28).
doAt(a22,30).
doAt(a11,31).
doAt(endflow,32).
doAt(a21,34).
doAt(endflow,35).
doAt(a5,37).
doAt(a13,38).
doAt(a4,39).
doAt(a3,40).
doAt(a8,41).
doAt(a2,42).
doAt(a25,43).
doAt(endflow,44).
doAt(a17,46).
doAt(a14,47).
doAt(endflow,48).
doAt(a19,50).
doAt(a12,51).
doAt(a18,52).
doAt(a9,53).
doAt(a15,54).
doAt(a10,55).
doAt(a20,56).
doAt(a23,57).
doAt(endflow,58).
doAt(a22,60).
doAt(a11,61).
doAt(endflow,62).
doAt(a21,64).
doAt(endflow,65).
leftrightnexts(27,30).
leftrightnexts(17,20).
leftrightnexts(13,16).
leftrightnexts(12,34).
leftrightnexts(57,60).
leftrightnexts(47,50).
leftrightnexts(43,46).
leftrightnexts(42,64).
leftrightnexts(6,37).