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(16,20).
next(20,21).
next(21,22).
next(22,23).
next(23,24).
next(24,25).
next(22,26).
next(26,27).
next(27,28).
next(28,29).
next(29,30).
next(30,31).
next(31,32).
next(29,33).
next(33,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(38,39).
next(36,40).
next(40,41).
next(41,42).
next(42,43).
next(35,44).
next(44,45).
doAt(startflow,6).
doAt(a21,8).
doAt(a15,10).
doAt(a16,12).
doAt(a24,13).
doAt(a20,14).
doAt(a4,15).
doAt(a12,16).
doAt(a19,17).
doAt(endflow,18).
doAt(a10,20).
doAt(a14,21).
doAt(a17,22).
doAt(a5,23).
doAt(endflow,24).
doAt(a9,26).
doAt(a1,27).
doAt(a13,28).
doAt(a6,29).
doAt(a23,30).
doAt(endflow,31).
doAt(a3,33).
doAt(a8,34).
doAt(a2,35).
doAt(a18,36).
doAt(a11,37).
doAt(endflow,38).
doAt(a7,40).
doAt(a22,41).
doAt(endflow,42).
doAt(endflow,44).
compAt(a15,x12,9).
compAt(a16,x18,11).
subsAt(a21,7).
leftrightnexts(37,40).
leftrightnexts(36,44).
leftrightnexts(30,33).
leftrightnexts(23,26).
leftrightnexts(17,20).