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(18,19).
next(19,20).
next(20,21).
next(21,22).
next(22,23).
next(23,24).
next(24,25).
next(21,26).
next(26,27).
next(27,28).
next(28,29).
next(29,30).
next(30,31).
next(27,32).
next(32,33).
next(33,34).
next(34,35).
next(35,36).
next(20,37).
next(37,38).
next(38,39).
next(39,40).
next(40,41).
next(37,42).
next(42,43).
next(43,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(48,49).
next(49,50).
next(46,51).
next(51,52).
next(52,53).
next(53,54).
next(54,55).
doAt(startflow,7).
doAt(a14,11).
doAt(a16,13).
doAt(a12,16).
doAt(a9,17).
doAt(a13,19).
doAt(a17,20).
doAt(a22,21).
doAt(a21,22).
doAt(a2,23).
doAt(endflow,24).
doAt(a3,26).
doAt(a20,27).
doAt(a10,28).
doAt(a2,29).
doAt(endflow,30).
doAt(a15,32).
doAt(a4,33).
doAt(a2,34).
doAt(endflow,35).
doAt(a18,37).
doAt(a25,38).
doAt(a2,39).
doAt(endflow,40).
doAt(a6,42).
doAt(a5,43).
doAt(a24,44).
doAt(a8,45).
doAt(a11,46).
doAt(a1,47).
doAt(a2,48).
doAt(endflow,49).
doAt(a19,51).
doAt(a23,52).
doAt(a2,53).
doAt(endflow,54).
compAt(a16,x24,8).
compAt(a12,x5,9).
compAt(a13,x18,10).
compAt(a13,x19,12).
compAt(a13,x8,14).
compAt(a12,x8,15).
subsAt(a13,18).
leftrightnexts(28,32).
leftrightnexts(22,26).
leftrightnexts(47,51).
leftrightnexts(38,42).
leftrightnexts(21,37).