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(20,27).
next(27,28).
next(28,29).
next(29,30).
next(30,31).
next(31,32).
next(32,33).
next(33,34).
next(34,35).
doAt(startflow,7).
doAt(a13,8).
doAt(a5,9).
doAt(a10,14).
doAt(a2,18).
doAt(a14,19).
doAt(a7,20).
doAt(a12,21).
doAt(a15,22).
doAt(a6,23).
doAt(a8,24).
doAt(endflow,25).
doAt(a4,27).
doAt(a3,28).
doAt(a9,29).
doAt(a11,30).
doAt(a15,31).
doAt(a6,32).
doAt(a8,33).
doAt(endflow,34).
compAt(a10,x5,10).
compAt(a14,x10,11).
compAt(a2,x10,12).
compAt(a10,x10,13).
compAt(a2,x3,15).
compAt(a14,x10,16).
compAt(a2,x10,17).
leftrightnexts(21,27).