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(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(36,37).
next(37,38).
next(38,39).
next(39,40).
next(35,41).
next(41,42).
next(42,43).
next(43,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
doAt(startflow,8).
doAt(a11,14).
doAt(a14,26).
doAt(a15,30).
doAt(a10,31).
doAt(a13,32).
doAt(a3,34).
doAt(a12,35).
doAt(a7,36).
doAt(a8,37).
doAt(a5,38).
doAt(endflow,39).
doAt(a2,41).
doAt(a6,42).
doAt(a1,43).
doAt(a9,44).
doAt(a8,45).
doAt(a5,46).
doAt(endflow,47).
compAt(a3,x2,9).
compAt(a13,x2,10).
compAt(a15,x2,11).
compAt(a14,x2,12).
compAt(a11,x2,13).
compAt(a3,x1,16).
compAt(a13,x1,17).
compAt(a10,x1,18).
compAt(a14,x1,19).
compAt(a3,x2,20).
compAt(a13,x2,21).
compAt(a15,x2,22).
compAt(a14,x2,23).
compAt(a15,x3,24).
compAt(a14,x3,25).
compAt(a3,x1,27).
compAt(a13,x1,28).
compAt(a10,x1,29).
compAt(a3,x1,33).
subsAt(a14,15).
leftrightnexts(36,41).