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(14,18).
next(18,19).
next(19,20).
next(12,21).
next(21,22).
next(22,23).
next(23,24).
next(24,25).
next(25,26).
next(23,27).
next(27,28).
next(28,29).
next(21,30).
next(30,31).
next(31,32).
next(32,33).
next(33,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(38,39).
next(36,40).
next(40,41).
next(41,42).
next(11,43).
next(43,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(48,49).
next(46,50).
next(50,51).
next(51,52).
next(10,53).
next(53,54).
next(54,55).
next(55,56).
next(56,57).
next(54,58).
next(58,59).
next(59,60).
doAt(startflow,3).
doAt(a24,5).
doAt(a21,6).
doAt(a22,7).
doAt(a18,8).
doAt(a14,9).
doAt(a5,10).
doAt(a25,11).
doAt(a7,12).
doAt(a1,13).
doAt(a2,14).
doAt(a13,15).
doAt(endflow,16).
doAt(a8,18).
doAt(endflow,19).
doAt(a19,21).
doAt(a10,22).
doAt(a2,23).
doAt(a13,24).
doAt(endflow,25).
doAt(a8,27).
doAt(endflow,28).
doAt(a23,30).
doAt(a6,31).
doAt(a11,32).
doAt(a12,33).
doAt(a3,34).
doAt(a17,35).
doAt(a2,36).
doAt(a13,37).
doAt(endflow,38).
doAt(a8,40).
doAt(endflow,41).
doAt(a20,43).
doAt(a16,44).
doAt(a4,45).
doAt(a2,46).
doAt(a13,47).
doAt(endflow,48).
doAt(a8,50).
doAt(endflow,51).
doAt(a9,53).
doAt(a2,54).
doAt(a13,55).
doAt(endflow,56).
doAt(a8,58).
doAt(endflow,59).
subsAt(a24,4).
leftrightnexts(15,18).
leftrightnexts(24,27).
leftrightnexts(37,40).
leftrightnexts(22,30).
leftrightnexts(13,21).
leftrightnexts(47,50).
leftrightnexts(12,43).
leftrightnexts(55,58).
leftrightnexts(11,53).