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(9,13).
next(13,14).
next(14,15).
next(15,16).
next(16,17).
next(14,18).
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(26,27).
next(27,28).
next(28,29).
next(26,30).
next(30,31).
next(31,32).
next(32,33).
next(25,34).
next(34,35).
next(4,36).
next(36,37).
next(37,38).
next(38,39).
next(39,40).
next(40,41).
next(41,42).
next(42,43).
next(40,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(45,49).
next(49,50).
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(59,60).
next(57,61).
next(61,62).
next(62,63).
next(63,64).
next(56,65).
next(65,66).
doAt(startflow,3).
doAt(a8,4).
doAt(a18,5).
doAt(a21,6).
doAt(a11,7).
doAt(a7,8).
doAt(a3,9).
doAt(a12,10).
doAt(endflow,11).
doAt(a16,13).
doAt(a20,14).
doAt(a25,15).
doAt(endflow,16).
doAt(a14,18).
doAt(a5,19).
doAt(a15,20).
doAt(a19,21).
doAt(a17,22).
doAt(a22,23).
doAt(a4,24).
doAt(a6,25).
doAt(a13,26).
doAt(a1,27).
doAt(endflow,28).
doAt(a10,30).
doAt(a24,31).
doAt(endflow,32).
doAt(endflow,34).
doAt(a23,36).
doAt(a9,37).
doAt(a11,38).
doAt(a7,39).
doAt(a3,40).
doAt(a12,41).
doAt(endflow,42).
doAt(a16,44).
doAt(a20,45).
doAt(a25,46).
doAt(endflow,47).
doAt(a14,49).
doAt(a5,50).
doAt(a15,51).
doAt(a19,52).
doAt(a17,53).
doAt(a22,54).
doAt(a4,55).
doAt(a6,56).
doAt(a13,57).
doAt(a1,58).
doAt(endflow,59).
doAt(a10,61).
doAt(a24,62).
doAt(endflow,63).
doAt(endflow,65).
leftrightnexts(27,30).
leftrightnexts(26,34).
leftrightnexts(15,18).
leftrightnexts(10,13).
leftrightnexts(58,61).
leftrightnexts(57,65).
leftrightnexts(46,49).
leftrightnexts(41,44).
leftrightnexts(5,36).