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(16,20).
next(20,21).
next(21,22).
next(14,23).
next(23,24).
next(24,25).
next(25,26).
next(26,27).
next(27,28).
next(28,29).
next(26,30).
next(30,31).
next(31,32).
next(24,33).
next(33,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(38,39).
next(39,40).
next(37,41).
next(41,42).
next(42,43).
next(35,44).
next(44,45).
next(45,46).
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(51,55).
next(55,56).
next(56,57).
next(34,58).
next(58,59).
next(59,60).
next(60,61).
next(61,62).
next(59,63).
next(63,64).
next(64,65).
doAt(startflow,6).
doAt(a7,7).
doAt(a11,9).
doAt(a17,12).
doAt(a13,13).
doAt(a23,14).
doAt(a22,15).
doAt(a24,16).
doAt(a9,17).
doAt(endflow,18).
doAt(a20,20).
doAt(endflow,21).
doAt(a1,23).
doAt(a16,24).
doAt(a3,25).
doAt(a24,26).
doAt(a9,27).
doAt(endflow,28).
doAt(a20,30).
doAt(endflow,31).
doAt(a2,33).
doAt(a19,34).
doAt(a14,35).
doAt(a21,36).
doAt(a24,37).
doAt(a9,38).
doAt(endflow,39).
doAt(a20,41).
doAt(endflow,42).
doAt(a25,44).
doAt(a15,45).
doAt(a12,46).
doAt(a10,47).
doAt(a4,48).
doAt(a8,49).
doAt(a6,50).
doAt(a24,51).
doAt(a9,52).
doAt(endflow,53).
doAt(a20,55).
doAt(endflow,56).
doAt(a18,58).
doAt(a24,59).
doAt(a9,60).
doAt(endflow,61).
doAt(a20,63).
doAt(endflow,64).
compAt(a17,x19,8).
compAt(a17,x18,11).
subsAt(a17,10).
leftrightnexts(17,20).
leftrightnexts(27,30).
leftrightnexts(38,41).
leftrightnexts(52,55).
leftrightnexts(36,44).
leftrightnexts(60,63).
leftrightnexts(35,58).
leftrightnexts(25,33).
leftrightnexts(15,23).