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(21,25).
next(25,26).
next(26,27).
next(27,28).
next(20,29).
next(29,30).
next(30,31).
next(31,32).
doAt(startflow,5).
doAt(a12,9).
doAt(a14,12).
doAt(a15,15).
doAt(a3,16).
doAt(a10,17).
doAt(a5,18).
doAt(a13,19).
doAt(a7,20).
doAt(a1,21).
doAt(a2,22).
doAt(endflow,23).
doAt(a9,25).
doAt(a8,26).
doAt(endflow,27).
doAt(a11,29).
doAt(a6,30).
doAt(endflow,31).
compAt(a15,x3,6).
compAt(a14,x3,7).
compAt(a12,x3,8).
compAt(a15,x3,10).
compAt(a14,x3,11).
compAt(a15,x1,13).
compAt(a15,x3,14).
leftrightnexts(22,25).
leftrightnexts(21,29).