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(14,18).
next(18,19).
next(19,20).
next(12,21).
next(21,22).
next(22,23).
next(23,24).
next(24,25).
next(25,26).
next(26,27).
next(24,28).
next(28,29).
next(29,30).
next(11,31).
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(40,41).
next(41,42).
next(39,43).
next(43,44).
next(44,45).
next(33,46).
next(46,47).
next(47,48).
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(54,58).
next(58,59).
next(59,60).
next(48,61).
next(61,62).
next(62,63).
next(63,64).
next(64,65).
next(65,66).
next(66,67).
next(67,68).
next(68,69).
next(66,70).
next(70,71).
next(71,72).
doAt(startflow,6).
doAt(a14,8).
doAt(a4,10).
doAt(a12,11).
doAt(a3,12).
doAt(a10,13).
doAt(a21,14).
doAt(a13,15).
doAt(endflow,16).
doAt(a22,18).
doAt(endflow,19).
doAt(a8,21).
doAt(a1,22).
doAt(a25,23).
doAt(a21,24).
doAt(a13,25).
doAt(endflow,26).
doAt(a22,28).
doAt(endflow,29).
doAt(a23,31).
doAt(a15,32).
doAt(a18,33).
doAt(a19,34).
doAt(a11,35).
doAt(a9,36).
doAt(a6,37).
doAt(a17,38).
doAt(a21,39).
doAt(a13,40).
doAt(endflow,41).
doAt(a22,43).
doAt(endflow,44).
doAt(a20,46).
doAt(a24,47).
doAt(a16,48).
doAt(a5,49).
doAt(a11,50).
doAt(a9,51).
doAt(a6,52).
doAt(a17,53).
doAt(a21,54).
doAt(a13,55).
doAt(endflow,56).
doAt(a22,58).
doAt(endflow,59).
doAt(a2,61).
doAt(a11,62).
doAt(a9,63).
doAt(a6,64).
doAt(a17,65).
doAt(a21,66).
doAt(a13,67).
doAt(endflow,68).
doAt(a22,70).
doAt(endflow,71).
subsAt(a14,7).
subsAt(a4,9).
leftrightnexts(15,18).
leftrightnexts(25,28).
leftrightnexts(13,21).
leftrightnexts(40,43).
leftrightnexts(55,58).
leftrightnexts(67,70).
leftrightnexts(49,61).
leftrightnexts(34,46).
leftrightnexts(12,31).