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(15,19).
next(19,20).
next(20,21).
next(21,22).
next(19,23).
next(23,24).
next(24,25).
next(25,26).
next(23,27).
next(27,28).
next(28,29).
next(29,30).
next(30,31).
next(13,32).
next(32,33).
next(33,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(35,39).
next(39,40).
next(40,41).
next(41,42).
next(39,43).
next(43,44).
next(44,45).
next(45,46).
next(43,47).
next(47,48).
next(48,49).
next(49,50).
next(50,51).
next(12,52).
next(52,53).
next(53,54).
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(60,64).
next(64,65).
next(65,66).
next(66,67).
next(64,68).
next(68,69).
next(69,70).
next(70,71).
next(71,72).
doAt(startflow,4).
doAt(a9,6).
doAt(a3,8).
doAt(a10,9).
doAt(a19,10).
doAt(a17,11).
doAt(a7,12).
doAt(a2,13).
doAt(a25,14).
doAt(a12,15).
doAt(a16,16).
doAt(endflow,17).
doAt(a18,19).
doAt(a8,20).
doAt(endflow,21).
doAt(a14,23).
doAt(a6,24).
doAt(endflow,25).
doAt(a1,27).
doAt(a11,28).
doAt(a5,29).
doAt(endflow,30).
doAt(a13,32).
doAt(a20,33).
doAt(a4,34).
doAt(a12,35).
doAt(a16,36).
doAt(endflow,37).
doAt(a18,39).
doAt(a8,40).
doAt(endflow,41).
doAt(a14,43).
doAt(a6,44).
doAt(endflow,45).
doAt(a1,47).
doAt(a11,48).
doAt(a5,49).
doAt(endflow,50).
doAt(a21,52).
doAt(a15,53).
doAt(a24,54).
doAt(a23,55).
doAt(a12,56).
doAt(a16,57).
doAt(endflow,58).
doAt(a18,60).
doAt(a8,61).
doAt(endflow,62).
doAt(a14,64).
doAt(a6,65).
doAt(endflow,66).
doAt(a1,68).
doAt(a11,69).
doAt(a5,70).
doAt(endflow,71).
compAt(a9,x6,5).
subsAt(a3,7).
leftrightnexts(24,27).
leftrightnexts(20,23).
leftrightnexts(16,19).
leftrightnexts(44,47).
leftrightnexts(40,43).
leftrightnexts(36,39).
leftrightnexts(14,32).
leftrightnexts(65,68).
leftrightnexts(61,64).
leftrightnexts(57,60).
leftrightnexts(13,52).