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(9,14).
next(14,15).
next(15,16).
next(16,17).
next(17,18).
next(14,19).
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(28,29).
next(29,30).
next(30,31).
next(31,32).
next(28,33).
next(33,34).
next(34,35).
next(35,36).
next(36,37).
next(33,38).
next(38,39).
next(39,40).
next(40,41).
next(27,42).
next(42,43).
next(43,44).
next(44,45).
doAt(startflow,3).
doAt(a5,5).
doAt(a20,6).
doAt(a15,7).
doAt(a4,8).
doAt(a25,9).
doAt(a13,10).
doAt(a17,11).
doAt(endflow,12).
doAt(a21,14).
doAt(a19,15).
doAt(a17,16).
doAt(endflow,17).
doAt(a16,19).
doAt(a2,20).
doAt(a14,21).
doAt(a9,22).
doAt(a24,23).
doAt(a7,24).
doAt(a23,25).
doAt(a1,26).
doAt(a18,27).
doAt(a3,28).
doAt(a6,29).
doAt(a17,30).
doAt(endflow,31).
doAt(a12,33).
doAt(a11,34).
doAt(a17,35).
doAt(endflow,36).
doAt(a22,38).
doAt(a17,39).
doAt(endflow,40).
doAt(a8,42).
doAt(a17,43).
doAt(endflow,44).
subsAt(a5,4).
leftrightnexts(34,38).
leftrightnexts(29,33).
leftrightnexts(28,42).
leftrightnexts(15,19).
leftrightnexts(10,14).