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(9,15).
next(15,16).
next(16,17).
next(17,18).
next(18,19).
next(19,20).
next(20,21).
next(8,22).
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(30,31).
next(31,32).
next(32,33).
next(33,34).
next(34,35).
next(25,36).
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(44,45).
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(53,54).
next(54,55).
next(55,56).
next(56,57).
next(57,58).
next(58,59).
next(59,60).
next(52,61).
next(61,62).
next(62,63).
next(63,64).
next(64,65).
next(65,66).
next(66,67).
next(67,68).
doAt(startflow,6).
doAt(a8,7).
doAt(a20,8).
doAt(a14,9).
doAt(a16,11).
doAt(a7,12).
doAt(endflow,13).
doAt(a17,15).
doAt(a22,16).
doAt(a7,17).
doAt(endflow,20).
doAt(a10,22).
doAt(a5,24).
doAt(a15,25).
doAt(a9,27).
doAt(a3,28).
doAt(a1,29).
doAt(a12,30).
doAt(a21,31).
doAt(a7,32).
doAt(endflow,34).
doAt(a18,37).
doAt(a13,38).
doAt(a11,39).
doAt(a6,40).
doAt(a3,41).
doAt(a1,42).
doAt(a12,43).
doAt(a21,44).
doAt(a7,45).
doAt(endflow,47).
doAt(a25,50).
doAt(a24,51).
doAt(a23,52).
doAt(a4,53).
doAt(a3,54).
doAt(a1,55).
doAt(a12,56).
doAt(a21,57).
doAt(a7,58).
doAt(endflow,59).
doAt(a19,61).
doAt(a3,62).
doAt(a1,63).
doAt(a12,64).
doAt(a21,65).
doAt(a7,66).
doAt(endflow,67).
compAt(a16,x6,18).
compAt(a16,x9,19).
compAt(a16,x6,23).
compAt(a16,x9,26).
compAt(a16,x4,33).
compAt(a16,x9,36).
compAt(a16,x4,46).
compAt(a16,x4,49).
subsAt(a16,10).
leftrightnexts(10,15).
leftrightnexts(53,61).
leftrightnexts(40,49).
leftrightnexts(26,36).
leftrightnexts(9,22).