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(21,22).
next(18,23).
next(23,24).
next(24,25).
next(25,26).
next(26,27).
next(27,28).
next(24,29).
next(29,30).
next(30,31).
next(31,32).
next(32,33).
next(33,34).
next(34,35).
next(31,36).
next(36,37).
next(37,38).
next(38,39).
next(39,40).
next(40,41).
next(41,42).
next(23,43).
next(43,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(44,49).
next(49,50).
next(50,51).
next(51,52).
doAt(startflow,7).
doAt(a14,9).
doAt(a2,11).
doAt(a6,14).
doAt(a12,15).
doAt(a8,16).
doAt(a1,17).
doAt(a7,18).
doAt(a19,19).
doAt(a16,20).
doAt(endflow,21).
doAt(a20,23).
doAt(a24,24).
doAt(a18,25).
doAt(a16,26).
doAt(endflow,27).
doAt(a5,29).
doAt(a3,30).
doAt(a15,31).
doAt(a22,32).
doAt(a16,33).
doAt(endflow,34).
doAt(a23,36).
doAt(a9,37).
doAt(a25,38).
doAt(a17,39).
doAt(a16,40).
doAt(endflow,41).
doAt(a13,43).
doAt(a21,44).
doAt(a10,45).
doAt(a16,46).
doAt(endflow,47).
doAt(a11,49).
doAt(a16,50).
doAt(endflow,51).
compAt(a12,x17,8).
compAt(a2,x5,10).
compAt(a6,x14,13).
subsAt(a6,12).
leftrightnexts(32,36).
leftrightnexts(25,29).
leftrightnexts(45,49).
leftrightnexts(24,43).
leftrightnexts(19,23).