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(18,19).
next(19,20).
next(17,21).
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(31,32).
next(21,33).
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(38,42).
next(42,43).
next(43,44).
next(44,45).
next(33,46).
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).
next(57,58).
doAt(startflow,4).
doAt(a13,5).
doAt(a4,7).
doAt(a24,8).
doAt(a8,9).
doAt(a11,10).
doAt(a6,11).
doAt(endflow,12).
doAt(a10,14).
doAt(a2,15).
doAt(a25,16).
doAt(a17,17).
doAt(a18,18).
doAt(endflow,19).
doAt(a21,21).
doAt(a7,22).
doAt(a19,23).
doAt(a14,24).
doAt(a12,25).
doAt(a15,26).
doAt(endflow,27).
doAt(a22,29).
doAt(a23,30).
doAt(endflow,31).
doAt(a16,33).
doAt(a20,34).
doAt(a9,35).
doAt(a19,36).
doAt(a14,37).
doAt(a12,38).
doAt(a15,39).
doAt(endflow,40).
doAt(a22,42).
doAt(a23,43).
doAt(endflow,44).
doAt(a3,46).
doAt(a1,47).
doAt(a9,48).
doAt(a19,49).
doAt(a14,50).
doAt(a12,51).
doAt(a15,52).
doAt(endflow,53).
doAt(a22,55).
doAt(a23,56).
doAt(endflow,57).
subsAt(a4,6).
leftrightnexts(26,29).
leftrightnexts(39,42).
leftrightnexts(52,55).
leftrightnexts(34,46).
leftrightnexts(22,33).
leftrightnexts(18,21).
leftrightnexts(10,14).