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(17,18).
next(18,19).
next(19,20).
next(20,21).
next(21,22).
next(19,23).
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(32,33).
next(24,34).
next(34,35).
next(6,36).
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(48,49).
next(49,50).
next(50,51).
next(51,52).
next(52,53).
next(50,54).
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(63,64).
next(55,65).
next(65,66).
doAt(startflow,4).
doAt(a12,5).
doAt(a13,6).
doAt(a18,7).
doAt(a14,8).
doAt(a20,9).
doAt(a1,10).
doAt(endflow,11).
doAt(a25,13).
doAt(a17,14).
doAt(a15,15).
doAt(a22,16).
doAt(a24,17).
doAt(a23,18).
doAt(a4,19).
doAt(a16,20).
doAt(endflow,21).
doAt(a2,23).
doAt(a11,24).
doAt(a19,25).
doAt(a5,26).
doAt(endflow,27).
doAt(a9,29).
doAt(a7,30).
doAt(a3,31).
doAt(endflow,32).
doAt(endflow,34).
doAt(a10,36).
doAt(a6,37).
doAt(a8,38).
doAt(a14,39).
doAt(a20,40).
doAt(a1,41).
doAt(endflow,42).
doAt(a25,44).
doAt(a17,45).
doAt(a15,46).
doAt(a22,47).
doAt(a24,48).
doAt(a23,49).
doAt(a4,50).
doAt(a16,51).
doAt(endflow,52).
doAt(a2,54).
doAt(a11,55).
doAt(a19,56).
doAt(a5,57).
doAt(endflow,58).
doAt(a9,60).
doAt(a7,61).
doAt(a3,62).
doAt(endflow,63).
doAt(endflow,65).
leftrightnexts(26,29).
leftrightnexts(25,34).
leftrightnexts(20,23).
leftrightnexts(10,13).
leftrightnexts(57,60).
leftrightnexts(56,65).
leftrightnexts(51,54).
leftrightnexts(41,44).
leftrightnexts(7,36).