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(11,15).
next(15,16).
next(16,17).
next(17,18).
next(18,19).
next(10,20).
next(20,21).
next(21,22).
next(22,23).
next(23,24).
next(24,25).
next(20,26).
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(32,37).
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(43,49).
next(49,50).
next(50,51).
next(51,52).
next(52,53).
doAt(startflow,6).
doAt(a21,9).
doAt(a5,10).
doAt(a13,11).
doAt(a11,12).
doAt(endflow,13).
doAt(a7,15).
doAt(endflow,18).
doAt(a6,20).
doAt(a24,21).
doAt(endflow,24).
doAt(a14,26).
doAt(a3,27).
doAt(a16,28).
doAt(a18,29).
doAt(a15,30).
doAt(a19,31).
doAt(a23,32).
doAt(a8,33).
doAt(endflow,35).
doAt(a10,37).
doAt(a9,38).
doAt(a22,39).
doAt(a2,40).
doAt(a20,41).
doAt(a25,42).
doAt(a12,43).
doAt(a17,44).
doAt(endflow,47).
doAt(a1,49).
doAt(endflow,52).
compAt(a11,x2,8).
compAt(a11,x19,16).
compAt(a11,x25,17).
compAt(a11,x19,22).
compAt(a11,x25,23).
compAt(a11,x19,34).
compAt(a11,x19,45).
compAt(a11,x25,46).
compAt(a11,x19,50).
compAt(a11,x25,51).
subsAt(a21,7).
leftrightnexts(12,15).
leftrightnexts(44,49).
leftrightnexts(33,37).
leftrightnexts(21,26).
leftrightnexts(11,20).