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(17,21).
next(21,22).
next(22,23).
next(16,24).
next(24,25).
next(13,26).
next(26,27).
next(27,28).
next(28,29).
next(29,30).
next(30,31).
next(31,32).
next(32,33).
next(33,34).
next(34,35).
next(35,36).
next(33,37).
next(37,38).
next(38,39).
next(32,40).
next(40,41).
next(12,42).
next(42,43).
next(43,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(48,49).
next(49,50).
next(47,51).
next(51,52).
next(52,53).
next(46,54).
next(54,55).
next(43,56).
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(64,65).
next(62,66).
next(66,67).
next(67,68).
next(61,69).
next(69,70).
doAt(startflow,5).
doAt(a3,7).
doAt(a5,9).
doAt(a6,10).
doAt(a16,11).
doAt(a21,12).
doAt(a7,13).
doAt(a8,14).
doAt(a19,15).
doAt(a9,16).
doAt(a13,17).
doAt(a4,18).
doAt(endflow,19).
doAt(a12,21).
doAt(endflow,22).
doAt(endflow,24).
doAt(a23,26).
doAt(a22,27).
doAt(a11,28).
doAt(a2,29).
doAt(a18,30).
doAt(a19,31).
doAt(a9,32).
doAt(a13,33).
doAt(a4,34).
doAt(endflow,35).
doAt(a12,37).
doAt(endflow,38).
doAt(endflow,40).
doAt(a15,42).
doAt(a20,43).
doAt(a24,44).
doAt(a19,45).
doAt(a9,46).
doAt(a13,47).
doAt(a4,48).
doAt(endflow,49).
doAt(a12,51).
doAt(endflow,52).
doAt(endflow,54).
doAt(a1,56).
doAt(a14,57).
doAt(a17,58).
doAt(a10,59).
doAt(a19,60).
doAt(a9,61).
doAt(a13,62).
doAt(a4,63).
doAt(endflow,64).
doAt(a12,66).
doAt(endflow,67).
doAt(endflow,69).
subsAt(a3,6).
subsAt(a5,8).
leftrightnexts(18,21).
leftrightnexts(17,24).
leftrightnexts(34,37).
leftrightnexts(33,40).
leftrightnexts(14,26).
leftrightnexts(48,51).
leftrightnexts(47,54).
leftrightnexts(63,66).
leftrightnexts(62,69).
leftrightnexts(44,56).
leftrightnexts(13,42).