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(10,20).
next(20,21).
next(21,22).
next(22,23).
next(23,24).
next(21,25).
next(25,26).
next(26,27).
next(27,28).
next(8,29).
next(29,30).
next(30,31).
next(31,32).
next(32,33).
next(33,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(38,39).
next(39,40).
next(40,41).
next(38,42).
next(42,43).
next(43,44).
next(44,45).
next(35,46).
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(47,58).
next(58,59).
next(59,60).
next(60,61).
next(61,62).
next(62,63).
next(60,64).
next(64,65).
next(65,66).
next(66,67).
doAt(startflow,4).
doAt(a20,5).
doAt(a10,7).
doAt(a24,8).
doAt(a19,9).
doAt(a11,10).
doAt(a25,11).
doAt(a5,12).
doAt(a1,13).
doAt(endflow,14).
doAt(a9,16).
doAt(a16,17).
doAt(endflow,18).
doAt(a12,20).
doAt(a5,21).
doAt(a1,22).
doAt(endflow,23).
doAt(a9,25).
doAt(a16,26).
doAt(endflow,27).
doAt(a7,29).
doAt(a6,30).
doAt(a17,31).
doAt(a4,32).
doAt(a22,33).
doAt(a8,34).
doAt(a13,35).
doAt(a15,36).
doAt(a2,37).
doAt(a5,38).
doAt(a1,39).
doAt(endflow,40).
doAt(a9,42).
doAt(a16,43).
doAt(endflow,44).
doAt(a3,46).
doAt(a21,47).
doAt(a23,48).
doAt(a2,49).
doAt(a5,50).
doAt(a1,51).
doAt(endflow,52).
doAt(a9,54).
doAt(a16,55).
doAt(endflow,56).
doAt(a18,58).
doAt(a2,59).
doAt(a5,60).
doAt(a1,61).
doAt(endflow,62).
doAt(a9,64).
doAt(a16,65).
doAt(endflow,66).
subsAt(a10,6).
leftrightnexts(13,16).
leftrightnexts(22,25).
leftrightnexts(11,20).
leftrightnexts(39,42).
leftrightnexts(51,54).
leftrightnexts(61,64).
leftrightnexts(48,58).
leftrightnexts(36,46).
leftrightnexts(9,29).