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(6,12).
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(18,23).
next(23,24).
next(24,25).
next(25,26).
next(17,27).
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(38,39).
next(39,40).
next(40,41).
next(41,42).
next(42,43).
next(43,44).
next(40,45).
next(45,46).
next(46,47).
next(47,48).
next(39,49).
next(49,50).
next(50,51).
next(51,52).
next(52,53).
next(35,54).
next(54,55).
next(55,56).
next(56,57).
next(57,58).
next(58,59).
next(59,60).
next(60,61).
next(61,62).
next(62,63).
next(63,64).
next(60,65).
next(65,66).
next(66,67).
next(67,68).
next(59,69).
next(69,70).
next(70,71).
next(71,72).
next(72,73).
doAt(startflow,4).
doAt(a2,5).
doAt(a23,6).
doAt(a18,7).
doAt(a4,8).
doAt(a14,9).
doAt(endflow,10).
doAt(a25,12).
doAt(a17,13).
doAt(a9,14).
doAt(a21,15).
doAt(a3,16).
doAt(a19,17).
doAt(a12,18).
doAt(a5,19).
doAt(a14,20).
doAt(endflow,21).
doAt(a10,23).
doAt(a14,24).
doAt(endflow,25).
doAt(a8,27).
doAt(a24,28).
doAt(a14,29).
doAt(endflow,30).
doAt(a20,32).
doAt(a13,33).
doAt(a11,34).
doAt(a22,35).
doAt(a1,36).
doAt(a21,37).
doAt(a3,38).
doAt(a19,39).
doAt(a12,40).
doAt(a5,41).
doAt(a14,42).
doAt(endflow,43).
doAt(a10,45).
doAt(a14,46).
doAt(endflow,47).
doAt(a8,49).
doAt(a24,50).
doAt(a14,51).
doAt(endflow,52).
doAt(a6,54).
doAt(a16,55).
doAt(a7,56).
doAt(a21,57).
doAt(a3,58).
doAt(a19,59).
doAt(a12,60).
doAt(a5,61).
doAt(a14,62).
doAt(endflow,63).
doAt(a10,65).
doAt(a14,66).
doAt(endflow,67).
doAt(a8,69).
doAt(a24,70).
doAt(a14,71).
doAt(endflow,72).
leftrightnexts(19,23).
leftrightnexts(18,27).
leftrightnexts(41,45).
leftrightnexts(40,49).
leftrightnexts(61,65).
leftrightnexts(60,69).
leftrightnexts(36,54).
leftrightnexts(14,32).
leftrightnexts(7,12).