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(11,16).
next(16,17).
next(17,18).
next(18,19).
next(19,20).
next(20,21).
next(17,22).
next(22,23).
next(23,24).
next(24,25).
next(25,26).
next(26,27).
next(27,28).
next(28,29).
next(25,30).
next(30,31).
next(31,32).
next(32,33).
next(33,34).
next(34,35).
next(35,36).
next(24,37).
next(37,38).
next(38,39).
next(39,40).
next(22,41).
next(41,42).
next(42,43).
next(43,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(44,49).
next(49,50).
next(50,51).
next(51,52).
next(52,53).
next(53,54).
next(54,55).
next(43,56).
next(56,57).
next(57,58).
next(58,59).
doAt(startflow,3).
doAt(a23,5).
doAt(a5,6).
doAt(a2,7).
doAt(a6,8).
doAt(a17,9).
doAt(a22,10).
doAt(a18,11).
doAt(a9,12).
doAt(a13,13).
doAt(endflow,14).
doAt(a20,16).
doAt(a15,17).
doAt(a12,18).
doAt(a13,19).
doAt(endflow,20).
doAt(a4,22).
doAt(a3,23).
doAt(a16,24).
doAt(a7,25).
doAt(a24,26).
doAt(a13,27).
doAt(endflow,28).
doAt(a11,30).
doAt(a1,31).
doAt(a14,32).
doAt(a25,33).
doAt(a13,34).
doAt(endflow,35).
doAt(a19,37).
doAt(a13,38).
doAt(endflow,39).
doAt(a8,41).
doAt(a10,42).
doAt(a16,43).
doAt(a7,44).
doAt(a24,45).
doAt(a13,46).
doAt(endflow,47).
doAt(a11,49).
doAt(a1,50).
doAt(a14,51).
doAt(a25,52).
doAt(a13,53).
doAt(endflow,54).
doAt(a19,56).
doAt(a13,57).
doAt(endflow,58).
subsAt(a23,4).
leftrightnexts(26,30).
leftrightnexts(25,37).
leftrightnexts(45,49).
leftrightnexts(44,56).
leftrightnexts(23,41).
leftrightnexts(18,22).
leftrightnexts(12,16).