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(19,20).
next(20,21).
next(15,22).
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(26,32).
next(32,33).
next(33,34).
next(34,35).
next(35,36).
next(36,37).
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).
next(38,51).
next(51,52).
doAt(startflow,5).
doAt(a15,9).
doAt(a16,11).
doAt(a20,12).
doAt(endflow,13).
doAt(a12,15).
doAt(a1,16).
doAt(endflow,20).
doAt(a2,22).
doAt(a17,23).
doAt(a13,24).
doAt(a21,26).
doAt(a9,27).
doAt(endflow,30).
doAt(a25,32).
doAt(a10,34).
doAt(a18,35).
doAt(a6,36).
doAt(a23,37).
doAt(a24,38).
doAt(a4,39).
doAt(a5,40).
doAt(endflow,41).
doAt(a22,43).
doAt(a11,44).
doAt(a3,45).
doAt(a19,46).
doAt(a14,47).
doAt(a7,48).
doAt(endflow,49).
doAt(endflow,51).
compAt(a20,x20,6).
compAt(a15,x20,7).
compAt(a20,x5,10).
compAt(a20,x1,17).
compAt(a20,x20,18).
compAt(a20,x23,19).
compAt(a20,x1,25).
compAt(a20,x20,28).
compAt(a20,x23,29).
compAt(a20,x20,33).
subsAt(a15,8).
leftrightnexts(40,43).
leftrightnexts(39,51).
leftrightnexts(27,32).
leftrightnexts(16,22).
leftrightnexts(12,15).