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(9,13).
next(13,14).
next(14,15).
next(3,16).
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(24,25).
next(25,26).
next(26,27).
next(27,28).
next(25,29).
next(29,30).
next(30,31).
next(21,32).
next(32,33).
next(33,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(38,39).
next(39,40).
next(37,41).
next(41,42).
next(42,43).
next(33,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(48,49).
next(49,50).
next(50,51).
next(51,52).
next(52,53).
next(53,54).
next(51,55).
next(55,56).
next(56,57).
doAt(startflow,2).
doAt(a8,3).
doAt(a4,4).
doAt(a6,5).
doAt(a22,6).
doAt(a3,7).
doAt(a17,8).
doAt(a21,9).
doAt(a11,10).
doAt(endflow,11).
doAt(a15,13).
doAt(endflow,14).
doAt(a25,16).
doAt(a23,17).
doAt(a12,18).
doAt(a9,19).
doAt(a1,20).
doAt(a24,21).
doAt(a10,22).
doAt(a3,23).
doAt(a17,24).
doAt(a21,25).
doAt(a11,26).
doAt(endflow,27).
doAt(a15,29).
doAt(endflow,30).
doAt(a20,32).
doAt(a5,33).
doAt(a16,34).
doAt(a3,35).
doAt(a17,36).
doAt(a21,37).
doAt(a11,38).
doAt(endflow,39).
doAt(a15,41).
doAt(endflow,42).
doAt(a2,44).
doAt(a18,45).
doAt(a13,46).
doAt(a14,47).
doAt(a7,48).
doAt(a3,49).
doAt(a17,50).
doAt(a21,51).
doAt(a11,52).
doAt(endflow,53).
doAt(a15,55).
doAt(endflow,56).
leftrightnexts(10,13).
leftrightnexts(26,29).
leftrightnexts(38,41).
leftrightnexts(52,55).
leftrightnexts(34,44).
leftrightnexts(22,32).
leftrightnexts(4,16).