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(16,22).
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(33,34).
next(31,35).
next(35,36).
next(36,37).
next(37,38).
next(28,39).
next(39,40).
next(40,41).
next(41,42).
next(42,43).
next(43,44).
next(41,45).
next(45,46).
next(46,47).
next(47,48).
doAt(startflow,6).
doAt(a3,8).
doAt(a5,10).
doAt(a9,11).
doAt(a7,13).
doAt(endflow,14).
doAt(a15,16).
doAt(a13,17).
doAt(endflow,20).
doAt(a18,22).
doAt(a6,23).
doAt(a17,24).
doAt(a19,26).
doAt(a8,27).
doAt(a10,28).
doAt(a12,29).
doAt(a1,30).
doAt(a11,31).
doAt(a14,32).
doAt(endflow,33).
doAt(a16,35).
doAt(a20,36).
doAt(endflow,37).
doAt(a4,39).
doAt(a1,40).
doAt(a11,41).
doAt(a14,42).
doAt(endflow,43).
doAt(a16,45).
doAt(a20,46).
doAt(endflow,47).
compAt(a7,x27,7).
compAt(a7,x29,18).
compAt(a7,x35,19).
compAt(a7,x29,25).
subsAt(a5,9).
subsAt(a7,12).
leftrightnexts(32,35).
leftrightnexts(42,45).
leftrightnexts(29,39).
leftrightnexts(17,22).
leftrightnexts(12,16).