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(19,23).
next(23,24).
next(24,25).
next(18,26).
next(26,27).
next(17,28).
next(28,29).
next(13,30).
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(37,41).
next(41,42).
next(42,43).
next(36,44).
next(44,45).
next(35,46).
next(46,47).
next(31,48).
next(48,49).
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(56,64).
next(64,65).
next(55,66).
next(66,67).
doAt(startflow,4).
doAt(a23,5).
doAt(a25,7).
doAt(a22,8).
doAt(a15,9).
doAt(a17,10).
doAt(a14,11).
doAt(a13,12).
doAt(a6,13).
doAt(a3,14).
doAt(a12,15).
doAt(a24,16).
doAt(a19,17).
doAt(a21,18).
doAt(a2,19).
doAt(a16,20).
doAt(endflow,21).
doAt(a7,23).
doAt(endflow,24).
doAt(endflow,26).
doAt(endflow,28).
doAt(a11,30).
doAt(a4,31).
doAt(a10,32).
doAt(a12,33).
doAt(a24,34).
doAt(a19,35).
doAt(a21,36).
doAt(a2,37).
doAt(a16,38).
doAt(endflow,39).
doAt(a7,41).
doAt(endflow,42).
doAt(endflow,44).
doAt(endflow,46).
doAt(a8,48).
doAt(a20,49).
doAt(a5,50).
doAt(a1,51).
doAt(a9,52).
doAt(a12,53).
doAt(a24,54).
doAt(a19,55).
doAt(a21,56).
doAt(a2,57).
doAt(a16,58).
doAt(endflow,59).
doAt(a7,61).
doAt(endflow,62).
doAt(endflow,64).
doAt(endflow,66).
compAt(a25,x9,6).
leftrightnexts(20,23).
leftrightnexts(19,26).
leftrightnexts(18,28).
leftrightnexts(38,41).
leftrightnexts(37,44).
leftrightnexts(36,46).
leftrightnexts(58,61).
leftrightnexts(57,64).
leftrightnexts(56,66).
leftrightnexts(32,48).
leftrightnexts(14,30).