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(13,19).
next(19,20).
next(20,21).
next(21,22).
next(22,23).
next(23,24).
next(24,25).
next(25,26).
next(22,27).
next(27,28).
next(28,29).
next(29,30).
next(30,31).
next(31,32).
next(10,33).
next(33,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(38,39).
next(39,40).
next(40,41).
next(41,42).
next(42,43).
next(38,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(48,49).
next(49,50).
next(50,51).
next(47,52).
next(52,53).
next(53,54).
next(54,55).
next(55,56).
next(56,57).
doAt(startflow,3).
doAt(a11,5).
doAt(a25,6).
doAt(a21,7).
doAt(a20,8).
doAt(a23,9).
doAt(a6,10).
doAt(a8,11).
doAt(a9,12).
doAt(a1,13).
doAt(a16,14).
doAt(a15,15).
doAt(a3,16).
doAt(endflow,17).
doAt(a13,19).
doAt(a22,20).
doAt(a24,21).
doAt(a18,22).
doAt(a10,23).
doAt(a3,24).
doAt(endflow,25).
doAt(a12,27).
doAt(a4,28).
doAt(a14,29).
doAt(a3,30).
doAt(endflow,31).
doAt(a7,33).
doAt(a17,34).
doAt(a2,35).
doAt(a19,36).
doAt(a9,37).
doAt(a1,38).
doAt(a16,39).
doAt(a15,40).
doAt(a3,41).
doAt(endflow,42).
doAt(a13,44).
doAt(a22,45).
doAt(a24,46).
doAt(a18,47).
doAt(a10,48).
doAt(a3,49).
doAt(endflow,50).
doAt(a12,52).
doAt(a4,53).
doAt(a14,54).
doAt(a3,55).
doAt(endflow,56).
subsAt(a11,4).
leftrightnexts(23,27).
leftrightnexts(14,19).
leftrightnexts(48,52).
leftrightnexts(39,44).
leftrightnexts(11,33).