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(16,20).
next(20,21).
next(21,22).
next(22,23).
next(14,24).
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(13,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(38,39).
next(36,40).
next(40,41).
next(41,42).
next(42,43).
next(11,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(48,49).
next(49,50).
next(50,51).
next(47,52).
next(52,53).
next(53,54).
next(54,55).
next(55,56).
next(45,57).
next(57,58).
next(58,59).
next(59,60).
next(60,61).
next(61,62).
next(62,63).
next(63,64).
next(64,65).
next(65,66).
next(66,67).
next(67,68).
next(65,69).
next(69,70).
next(70,71).
next(71,72).
doAt(startflow,8).
doAt(a21,10).
doAt(a23,11).
doAt(a14,13).
doAt(a25,14).
doAt(a5,15).
doAt(a17,16).
doAt(a24,17).
doAt(endflow,18).
doAt(a22,20).
doAt(a9,21).
doAt(endflow,22).
doAt(a20,24).
doAt(a6,25).
doAt(a17,26).
doAt(a24,27).
doAt(endflow,28).
doAt(a22,30).
doAt(a9,31).
doAt(endflow,32).
doAt(a12,34).
doAt(a7,35).
doAt(a17,36).
doAt(a24,37).
doAt(endflow,38).
doAt(a22,40).
doAt(a9,41).
doAt(endflow,42).
doAt(a16,44).
doAt(a8,45).
doAt(a11,46).
doAt(a17,47).
doAt(a24,48).
doAt(endflow,50).
doAt(a22,52).
doAt(a9,53).
doAt(endflow,55).
doAt(a1,57).
doAt(a18,58).
doAt(a13,59).
doAt(a19,60).
doAt(a3,61).
doAt(a4,62).
doAt(a15,63).
doAt(a10,64).
doAt(a17,65).
doAt(a24,66).
doAt(endflow,67).
doAt(a22,69).
doAt(a9,70).
doAt(endflow,71).
compAt(a21,x19,9).
compAt(a5,x13,12).
compAt(a5,x13,49).
compAt(a5,x13,54).
leftrightnexts(17,20).
leftrightnexts(27,30).
leftrightnexts(15,24).
leftrightnexts(37,40).
leftrightnexts(14,34).
leftrightnexts(48,52).
leftrightnexts(66,69).
leftrightnexts(46,57).
leftrightnexts(12,44).