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(10,16).
next(16,17).
next(17,18).
next(18,19).
next(19,20).
next(20,21).
next(21,22).
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(36,37).
next(33,38).
next(38,39).
next(39,40).
next(40,41).
next(41,42).
next(42,43).
next(43,44).
next(40,45).
next(45,46).
next(46,47).
next(47,48).
next(48,49).
next(49,50).
next(46,51).
next(51,52).
next(52,53).
next(53,54).
doAt(startflow,7).
doAt(a23,8).
doAt(a14,9).
doAt(a13,10).
doAt(a21,12).
doAt(a1,13).
doAt(endflow,14).
doAt(a22,17).
doAt(a20,19).
doAt(a4,20).
doAt(a2,23).
doAt(a25,24).
doAt(a5,26).
doAt(a12,28).
doAt(endflow,29).
doAt(a8,31).
doAt(a9,32).
doAt(a24,33).
doAt(a10,34).
doAt(endflow,36).
doAt(a17,38).
doAt(a7,39).
doAt(a3,40).
doAt(a16,41).
doAt(endflow,43).
doAt(a6,45).
doAt(a19,46).
doAt(a11,47).
doAt(endflow,49).
doAt(a18,51).
doAt(endflow,53).
compAt(a1,x23,16).
compAt(a21,x12,18).
compAt(a21,x4,21).
compAt(a1,x19,22).
compAt(a1,x10,25).
compAt(a21,x21,27).
compAt(a21,x21,35).
compAt(a21,x21,42).
compAt(a21,x21,48).
compAt(a21,x21,52).
subsAt(a21,11).
leftrightnexts(47,51).
leftrightnexts(41,45).
leftrightnexts(34,38).
leftrightnexts(27,31).
leftrightnexts(11,16).