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(11,16).
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(19,25).
next(25,26).
next(26,27).
next(27,28).
next(28,29).
next(29,30).
next(25,31).
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(39,43).
next(43,44).
next(44,45).
next(45,46).
next(46,47).
next(38,48).
next(48,49).
next(49,50).
doAt(startflow,7).
doAt(a7,8).
doAt(a20,10).
doAt(a10,11).
doAt(a23,12).
doAt(a3,13).
doAt(endflow,14).
doAt(a13,16).
doAt(a5,17).
doAt(a21,19).
doAt(a24,20).
doAt(endflow,23).
doAt(a1,25).
doAt(a16,26).
doAt(endflow,29).
doAt(a14,31).
doAt(a2,32).
doAt(a4,33).
doAt(a8,34).
doAt(a22,35).
doAt(a17,36).
doAt(a25,38).
doAt(a6,39).
doAt(a15,40).
doAt(endflow,41).
doAt(a9,43).
doAt(a12,44).
doAt(a18,45).
doAt(endflow,46).
doAt(a19,48).
doAt(endflow,49).
compAt(a3,x3,9).
compAt(a3,x1,18).
compAt(a23,x12,21).
compAt(a3,x23,22).
compAt(a23,x12,27).
compAt(a3,x23,28).
compAt(a3,x23,37).
leftrightnexts(40,43).
leftrightnexts(39,48).
leftrightnexts(26,31).
leftrightnexts(20,25).
leftrightnexts(12,16).