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(17,29).
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).
doAt(startflow,8).
doAt(a8,10).
doAt(a5,12).
doAt(a13,15).
doAt(a4,17).
doAt(a9,19).
doAt(a7,20).
doAt(a1,21).
doAt(a6,22).
doAt(a14,23).
doAt(a10,24).
doAt(a15,25).
doAt(a2,26).
doAt(endflow,27).
doAt(a3,29).
doAt(a11,30).
doAt(a7,31).
doAt(a1,32).
doAt(a6,33).
doAt(a14,34).
doAt(a10,35).
doAt(a15,36).
doAt(a2,37).
doAt(endflow,38).
compAt(a8,x8,9).
compAt(a13,x9,11).
compAt(a13,x7,13).
compAt(a9,x15,14).
compAt(a7,x11,16).
subsAt(a9,18).
leftrightnexts(18,29).