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(16,23).
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(33,34).
next(34,35).
next(35,36).
next(25,37).
next(37,38).
next(38,39).
next(39,40).
next(40,41).
next(41,42).
next(42,43).
next(43,44).
next(44,45).
next(45,46).
next(46,47).
doAt(startflow,8).
doAt(a1,12).
doAt(a5,14).
doAt(a9,16).
doAt(a10,17).
doAt(a14,18).
doAt(a2,19).
doAt(a4,20).
doAt(endflow,21).
doAt(a15,23).
doAt(a13,25).
doAt(a6,26).
doAt(a11,27).
doAt(a3,28).
doAt(a8,30).
doAt(a2,31).
doAt(a4,32).
doAt(endflow,35).
doAt(a7,37).
doAt(a11,38).
doAt(a3,39).
doAt(a8,41).
doAt(a2,42).
doAt(a4,43).
doAt(endflow,46).
compAt(a2,x9,9).
compAt(a14,x9,10).
compAt(a2,x7,11).
compAt(a2,x6,15).
compAt(a2,x11,24).
compAt(a10,x14,29).
compAt(a10,x13,33).
compAt(a14,x5,34).
compAt(a10,x14,40).
compAt(a10,x13,44).
compAt(a14,x5,45).
subsAt(a5,13).
leftrightnexts(26,37).
leftrightnexts(17,23).