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(8,17).
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(4,26).
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(28,37).
next(37,38).
next(38,39).
next(39,40).
next(40,41).
next(41,42).
next(42,43).
next(43,44).
next(44,45).
doAt(startflow,3).
doAt(a15,4).
doAt(a14,5).
doAt(a3,6).
doAt(a10,7).
doAt(a5,8).
doAt(a4,9).
doAt(a11,10).
doAt(a13,11).
doAt(a9,12).
doAt(a2,13).
doAt(a7,14).
doAt(endflow,15).
doAt(a6,17).
doAt(a8,18).
doAt(a11,19).
doAt(a13,20).
doAt(a9,21).
doAt(a2,22).
doAt(a7,23).
doAt(endflow,24).
doAt(a12,26).
doAt(a10,27).
doAt(a5,28).
doAt(a4,29).
doAt(a11,30).
doAt(a13,31).
doAt(a9,32).
doAt(a2,33).
doAt(a7,34).
doAt(endflow,35).
doAt(a6,37).
doAt(a8,38).
doAt(a11,39).
doAt(a13,40).
doAt(a9,41).
doAt(a2,42).
doAt(a7,43).
doAt(endflow,44).
leftrightnexts(9,17).
leftrightnexts(29,37).
leftrightnexts(5,26).