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(8,12).
next(12,13).
next(13,14).
next(14,15).
next(15,16).
next(16,17).
next(17,18).
next(18,19).
next(19,20).
next(20,21).
next(18,22).
next(22,23).
next(23,24).
next(17,25).
next(25,26).
next(14,27).
next(27,28).
next(28,29).
next(29,30).
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(39,40).
next(37,41).
next(41,42).
next(42,43).
next(36,44).
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(54,55).
next(52,56).
next(56,57).
next(57,58).
next(51,59).
next(59,60).
doAt(startflow,4).
doAt(a9,7).
doAt(a4,8).
doAt(a16,9).
doAt(endflow,10).
doAt(a20,12).
doAt(a7,13).
doAt(a11,14).
doAt(a2,15).
doAt(a6,16).
doAt(a19,17).
doAt(a23,18).
doAt(a1,19).
doAt(endflow,20).
doAt(a15,22).
doAt(endflow,23).
doAt(endflow,25).
doAt(a22,27).
doAt(a24,28).
doAt(a10,29).
doAt(a14,30).
doAt(a17,31).
doAt(a25,32).
doAt(a21,33).
doAt(a18,34).
doAt(a6,35).
doAt(a19,36).
doAt(a23,37).
doAt(a1,38).
doAt(endflow,39).
doAt(a15,41).
doAt(endflow,42).
doAt(endflow,44).
doAt(a12,46).
doAt(a3,47).
doAt(a5,48).
doAt(a13,49).
doAt(a6,50).
doAt(a19,51).
doAt(a23,52).
doAt(a1,53).
doAt(endflow,54).
doAt(a15,56).
doAt(endflow,57).
doAt(endflow,59).
compAt(a9,x17,5).
subsAt(a9,6).
leftrightnexts(19,22).
leftrightnexts(18,25).
leftrightnexts(38,41).
leftrightnexts(37,44).
leftrightnexts(53,56).
leftrightnexts(52,59).
leftrightnexts(34,46).
leftrightnexts(15,27).
leftrightnexts(9,12).