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(10,23).
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(33,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(35,39).
next(39,40).
next(40,41).
doAt(startflow,8).
doAt(a2,9).
doAt(a3,10).
doAt(a13,11).
doAt(a1,13).
doAt(a5,14).
doAt(a9,15).
doAt(a12,16).
doAt(a4,17).
doAt(endflow,18).
doAt(a6,20).
doAt(endflow,21).
doAt(a8,23).
doAt(a15,24).
doAt(a14,25).
doAt(a7,29).
doAt(a10,30).
doAt(a1,32).
doAt(a5,33).
doAt(a9,34).
doAt(a12,35).
doAt(a4,36).
doAt(endflow,37).
doAt(a6,39).
doAt(endflow,40).
compAt(a9,x13,26).
compAt(a1,x13,27).
compAt(a5,x28,28).
subsAt(a1,12).
subsAt(a1,31).
leftrightnexts(17,20).
leftrightnexts(36,39).
leftrightnexts(11,23).