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(16,21).
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(29,34).
next(34,35).
next(35,36).
next(36,37).
doAt(startflow,7).
doAt(a10,9).
doAt(a3,13).
doAt(a5,14).
doAt(a1,16).
doAt(a8,18).
doAt(endflow,19).
doAt(a4,21).
doAt(a9,23).
doAt(a2,24).
doAt(a7,25).
doAt(a13,27).
doAt(a6,28).
doAt(a12,29).
doAt(a15,31).
doAt(endflow,32).
doAt(a14,35).
doAt(endflow,36).
compAt(a5,x8,8).
compAt(a8,x9,10).
compAt(a5,x9,11).
compAt(a5,x11,12).
compAt(a8,x4,15).
compAt(a8,x3,17).
compAt(a8,x9,22).
compAt(a8,x7,26).
compAt(a8,x3,30).
compAt(a8,x3,34).
leftrightnexts(30,34).
leftrightnexts(17,21).