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(20,25).
next(25,26).
next(26,27).
next(27,28).
next(28,29).
next(25,30).
next(30,31).
next(31,32).
next(32,33).
doAt(startflow,7).
doAt(a13,8).
doAt(a6,10).
doAt(a5,13).
doAt(a11,14).
doAt(a12,16).
doAt(a1,17).
doAt(a3,18).
doAt(a8,19).
doAt(a7,20).
doAt(a2,21).
doAt(a15,22).
doAt(endflow,23).
doAt(a10,25).
doAt(a14,26).
doAt(a15,27).
doAt(endflow,28).
doAt(a9,30).
doAt(a15,31).
doAt(endflow,32).
compAt(a5,x7,9).
compAt(a12,x2,11).
compAt(a5,x2,12).
compAt(a12,x9,15).
leftrightnexts(26,30).
leftrightnexts(21,25).