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(19,20).
next(20,21).
next(16,22).
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(26,31).
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(39,43).
next(43,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(48,49).
next(49,50).
doAt(startflow,8).
doAt(a23,9).
doAt(a8,12).
doAt(a17,14).
doAt(a18,16).
doAt(a11,18).
doAt(a5,19).
doAt(endflow,20).
doAt(a6,22).
doAt(a13,23).
doAt(a12,25).
doAt(a7,26).
doAt(a10,27).
doAt(endflow,29).
doAt(a20,31).
doAt(a3,32).
doAt(a2,33).
doAt(endflow,35).
doAt(a21,37).
doAt(a4,38).
doAt(a25,39).
doAt(a9,40).
doAt(endflow,41).
doAt(a14,43).
doAt(a15,44).
doAt(a19,45).
doAt(a16,46).
doAt(a1,47).
doAt(a24,48).
doAt(endflow,49).
compAt(a5,x15,10).
compAt(a8,x15,11).
compAt(a5,x24,13).
compAt(a5,x18,15).
compAt(a5,x15,24).
compAt(a11,x20,28).
compAt(a11,x20,34).
subsAt(a11,17).
leftrightnexts(40,43).
leftrightnexts(33,37).
leftrightnexts(27,31).
leftrightnexts(17,22).