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(15,20).
next(20,21).
next(21,22).
next(22,23).
next(23,24).
next(20,25).
next(25,26).
next(26,27).
next(27,28).
next(28,29).
next(29,30).
next(30,31).
next(31,32).
next(28,33).
next(33,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(33,39).
next(39,40).
next(40,41).
next(41,42).
next(42,43).
next(43,44).
next(27,45).
next(45,46).
next(46,47).
next(47,48).
doAt(startflow,4).
doAt(a18,5).
doAt(a2,8).
doAt(a14,9).
doAt(a24,10).
doAt(a4,11).
doAt(a21,12).
doAt(a12,13).
doAt(a13,14).
doAt(a20,15).
doAt(a23,16).
doAt(a11,17).
doAt(endflow,18).
doAt(a22,20).
doAt(a7,21).
doAt(a11,22).
doAt(endflow,23).
doAt(a17,25).
doAt(a6,26).
doAt(a3,27).
doAt(a10,28).
doAt(a1,29).
doAt(a11,30).
doAt(endflow,31).
doAt(a5,33).
doAt(a15,34).
doAt(a16,35).
doAt(a11,36).
doAt(endflow,37).
doAt(a19,39).
doAt(a25,40).
doAt(a16,41).
doAt(a11,42).
doAt(endflow,43).
doAt(a8,45).
doAt(a11,46).
doAt(endflow,47).
compAt(a2,x2,7).
subsAt(a2,6).
leftrightnexts(34,39).
leftrightnexts(29,33).
leftrightnexts(28,45).
leftrightnexts(21,25).
leftrightnexts(16,20).