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(8,13).
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(17,22).
next(22,23).
next(23,24).
next(24,25).
next(25,26).
next(26,27).
next(27,28).
next(22,29).
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(38,39).
next(39,40).
next(40,41).
next(41,42).
next(42,43).
next(37,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(48,49).
doAt(startflow,5).
doAt(a21,6).
doAt(a20,8).
doAt(a7,9).
doAt(a8,10).
doAt(endflow,11).
doAt(a3,13).
doAt(a9,14).
doAt(a1,15).
doAt(a23,16).
doAt(a10,17).
doAt(a4,18).
doAt(endflow,20).
doAt(a2,22).
doAt(a12,23).
doAt(a15,24).
doAt(endflow,27).
doAt(a19,29).
doAt(a16,30).
doAt(a18,31).
doAt(a6,32).
doAt(a25,33).
doAt(a22,34).
doAt(a14,35).
doAt(a24,36).
doAt(a5,37).
doAt(a17,38).
doAt(a15,39).
doAt(endflow,42).
doAt(a11,44).
doAt(a15,45).
doAt(endflow,48).
compAt(a7,x18,7).
compAt(a7,x12,19).
compAt(a7,x6,25).
compAt(a7,x12,26).
compAt(a7,x6,40).
compAt(a7,x12,41).
compAt(a7,x6,46).
compAt(a7,x12,47).
leftrightnexts(38,44).
leftrightnexts(23,29).
leftrightnexts(18,22).
leftrightnexts(9,13).