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(15,16).
next(16,17).
next(17,18).
next(18,19).
next(19,20).
next(20,21).
next(21,22).
next(22,23).
next(20,24).
next(24,25).
next(25,26).
next(26,27).
next(19,28).
next(28,29).
next(29,30).
next(30,31).
next(31,32).
next(32,33).
next(33,34).
next(31,35).
next(35,36).
next(36,37).
next(37,38).
next(38,39).
next(30,40).
next(40,41).
next(41,42).
next(17,43).
next(43,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(48,49).
next(46,50).
next(50,51).
next(51,52).
next(52,53).
next(45,54).
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(64,65).
next(56,66).
next(66,67).
next(67,68).
doAt(startflow,7).
doAt(a24,10).
doAt(a14,11).
doAt(a17,12).
doAt(a12,14).
doAt(a5,15).
doAt(a8,16).
doAt(a4,17).
doAt(a18,18).
doAt(a21,19).
doAt(a2,20).
doAt(a1,21).
doAt(endflow,22).
doAt(a10,24).
doAt(a9,25).
doAt(endflow,26).
doAt(a23,28).
doAt(a25,29).
doAt(a15,30).
doAt(a16,31).
doAt(a20,32).
doAt(endflow,33).
doAt(a11,35).
doAt(a13,36).
doAt(a7,37).
doAt(endflow,38).
doAt(a19,40).
doAt(endflow,41).
doAt(a3,43).
doAt(a22,44).
doAt(a21,45).
doAt(a2,46).
doAt(a1,47).
doAt(endflow,48).
doAt(a10,50).
doAt(a9,51).
doAt(endflow,52).
doAt(a23,54).
doAt(a25,55).
doAt(a15,56).
doAt(a16,57).
doAt(a20,58).
doAt(endflow,59).
doAt(a11,61).
doAt(a13,62).
doAt(a7,63).
doAt(endflow,64).
doAt(a19,66).
doAt(endflow,67).
compAt(a5,x4,9).
subsAt(a24,8).
subsAt(a12,13).
leftrightnexts(21,24).
leftrightnexts(32,35).
leftrightnexts(31,40).
leftrightnexts(20,28).
leftrightnexts(47,50).
leftrightnexts(58,61).
leftrightnexts(57,66).
leftrightnexts(46,54).
leftrightnexts(18,43).