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(14,19).
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(30,31).
next(31,32).
next(32,33).
next(29,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(38,39).
next(36,40).
next(40,41).
next(41,42).
next(42,43).
next(34,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
doAt(startflow,7).
doAt(a23,10).
doAt(a11,11).
doAt(a1,13).
doAt(a6,14).
doAt(a16,15).
doAt(a17,16).
doAt(endflow,17).
doAt(a5,19).
doAt(a2,20).
doAt(a15,21).
doAt(a9,23).
doAt(a7,24).
doAt(a24,25).
doAt(a18,26).
doAt(a25,27).
doAt(a3,28).
doAt(a10,29).
doAt(a19,30).
doAt(endflow,32).
doAt(a8,34).
doAt(a4,36).
doAt(a14,37).
doAt(endflow,38).
doAt(a20,40).
doAt(a22,41).
doAt(endflow,42).
doAt(a12,45).
doAt(a21,46).
doAt(endflow,47).
compAt(a11,x4,9).
compAt(a16,x21,12).
compAt(a16,x12,22).
compAt(a16,x24,31).
compAt(a16,x24,35).
compAt(a16,x24,44).
subsAt(a23,8).
leftrightnexts(37,40).
leftrightnexts(35,44).
leftrightnexts(30,34).
leftrightnexts(15,19).