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(13,17).
next(17,18).
next(18,19).
next(19,20).
next(9,21).
next(21,22).
next(22,23).
next(23,24).
next(24,25).
next(25,26).
next(26,27).
next(27,28).
next(28,29).
next(29,30).
next(27,31).
next(31,32).
next(32,33).
next(33,34).
next(24,35).
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(41,45).
next(45,46).
next(46,47).
next(47,48).
next(37,49).
next(49,50).
next(50,51).
next(51,52).
next(52,53).
next(53,54).
next(54,55).
next(52,56).
next(56,57).
next(57,58).
next(58,59).
next(23,60).
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(68,69).
doAt(startflow,3).
doAt(a13,5).
doAt(a22,6).
doAt(a7,7).
doAt(a8,8).
doAt(a3,9).
doAt(a25,10).
doAt(a9,11).
doAt(a21,12).
doAt(a6,13).
doAt(a2,14).
doAt(endflow,15).
doAt(a15,17).
doAt(a11,18).
doAt(endflow,19).
doAt(a5,21).
doAt(a14,22).
doAt(a23,23).
doAt(a4,24).
doAt(a12,25).
doAt(a21,26).
doAt(a6,27).
doAt(a2,28).
doAt(endflow,29).
doAt(a15,31).
doAt(a11,32).
doAt(endflow,33).
doAt(a24,35).
doAt(a17,36).
doAt(a20,37).
doAt(a18,38).
doAt(a19,39).
doAt(a21,40).
doAt(a6,41).
doAt(a2,42).
doAt(endflow,43).
doAt(a15,45).
doAt(a11,46).
doAt(endflow,47).
doAt(a1,49).
doAt(a19,50).
doAt(a21,51).
doAt(a6,52).
doAt(a2,53).
doAt(endflow,54).
doAt(a15,56).
doAt(a11,57).
doAt(endflow,58).
doAt(a10,60).
doAt(a21,61).
doAt(a6,62).
doAt(a2,63).
doAt(endflow,64).
doAt(a15,66).
doAt(a11,67).
doAt(endflow,68).
subsAt(a13,4).
leftrightnexts(14,17).
leftrightnexts(28,31).
leftrightnexts(42,45).
leftrightnexts(53,56).
leftrightnexts(38,49).
leftrightnexts(25,35).
leftrightnexts(63,66).
leftrightnexts(24,60).
leftrightnexts(10,21).