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(19,23).
next(23,24).
next(24,25).
next(25,26).
next(23,27).
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(36,37).
next(37,38).
next(35,39).
next(39,40).
next(40,41).
next(29,42).
next(42,43).
next(43,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(48,49).
next(49,50).
next(47,51).
next(51,52).
next(52,53).
doAt(startflow,5).
doAt(a21,9).
doAt(a4,12).
doAt(a5,13).
doAt(a13,14).
doAt(a1,15).
doAt(a19,16).
doAt(a17,17).
doAt(a8,18).
doAt(a12,19).
doAt(a9,20).
doAt(endflow,21).
doAt(a16,23).
doAt(a23,24).
doAt(endflow,25).
doAt(a22,27).
doAt(a6,28).
doAt(a15,29).
doAt(a2,30).
doAt(a7,31).
doAt(a10,32).
doAt(a14,33).
doAt(a11,34).
doAt(a24,35).
doAt(a20,36).
doAt(endflow,37).
doAt(a3,39).
doAt(endflow,40).
doAt(a25,42).
doAt(a7,43).
doAt(a10,44).
doAt(a14,45).
doAt(a11,46).
doAt(a24,47).
doAt(a20,48).
doAt(endflow,49).
doAt(a3,51).
doAt(endflow,52).
compAt(a5,x3,7).
compAt(a5,x20,8).
compAt(a5,x10,11).
subsAt(a21,6).
subsAt(a4,10).
leftrightnexts(36,39).
leftrightnexts(48,51).
leftrightnexts(30,42).
leftrightnexts(24,27).
leftrightnexts(20,23).