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(11,17).
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(24,28).
next(28,29).
next(29,30).
next(30,31).
next(31,32).
next(32,33).
next(30,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(38,39).
next(29,40).
next(40,41).
next(41,42).
next(42,43).
next(43,44).
next(44,45).
next(45,46).
next(28,47).
next(47,48).
next(48,49).
next(49,50).
doAt(startflow,7).
doAt(a14,9).
doAt(a9,10).
doAt(a17,11).
doAt(a12,12).
doAt(a19,14).
doAt(endflow,15).
doAt(a23,17).
doAt(a21,19).
doAt(a5,20).
doAt(a11,21).
doAt(a25,23).
doAt(a24,24).
doAt(a22,25).
doAt(endflow,26).
doAt(a1,28).
doAt(a2,29).
doAt(a10,30).
doAt(a15,31).
doAt(endflow,32).
doAt(a7,34).
doAt(a6,35).
doAt(a13,36).
doAt(endflow,38).
doAt(a4,40).
doAt(a16,41).
doAt(a3,42).
doAt(a8,43).
doAt(endflow,45).
doAt(a18,47).
doAt(endflow,49).
compAt(a19,x9,18).
compAt(a12,x10,22).
compAt(a19,x8,37).
compAt(a19,x8,44).
compAt(a19,x8,48).
subsAt(a14,8).
subsAt(a19,13).
leftrightnexts(31,34).
leftrightnexts(30,40).
leftrightnexts(29,47).
leftrightnexts(25,28).
leftrightnexts(12,17).