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(22,23).
next(23,24).
next(21,25).
next(25,26).
next(26,27).
next(27,28).
next(28,29).
next(29,30).
next(30,31).
next(28,32).
next(32,33).
next(33,34).
next(34,35).
next(35,36).
next(36,37).
next(34,38).
next(38,39).
next(39,40).
next(32,41).
next(41,42).
next(42,43).
next(43,44).
next(44,45).
next(42,46).
next(46,47).
next(47,48).
doAt(startflow,7).
doAt(a1,9).
doAt(a16,11).
doAt(a15,12).
doAt(a6,13).
doAt(a18,14).
doAt(a3,15).
doAt(a20,16).
doAt(a17,17).
doAt(a10,18).
doAt(a14,19).
doAt(a7,20).
doAt(a5,21).
doAt(a8,22).
doAt(endflow,23).
doAt(a21,25).
doAt(a4,26).
doAt(a23,27).
doAt(a2,28).
doAt(a13,29).
doAt(endflow,30).
doAt(a19,32).
doAt(a9,33).
doAt(a25,34).
doAt(a11,35).
doAt(endflow,36).
doAt(a12,38).
doAt(endflow,39).
doAt(a22,41).
doAt(a25,42).
doAt(a11,43).
doAt(endflow,44).
doAt(a12,46).
doAt(endflow,47).
compAt(a16,x24,8).
compAt(a16,x13,10).
leftrightnexts(35,38).
leftrightnexts(43,46).
leftrightnexts(33,41).
leftrightnexts(29,32).
leftrightnexts(22,25).