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(8,16).
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(25,26).
next(26,27).
next(27,28).
next(28,29).
next(23,30).
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(40,41).
next(36,42).
next(42,43).
next(43,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(35,49).
next(49,50).
next(50,51).
next(51,52).
next(52,53).
next(53,54).
doAt(startflow,6).
doAt(a16,8).
doAt(a15,9).
doAt(a6,11).
doAt(a25,13).
doAt(endflow,14).
doAt(a7,16).
doAt(a19,17).
doAt(a18,19).
doAt(a14,20).
doAt(a21,21).
doAt(a11,22).
doAt(a23,23).
doAt(a22,24).
doAt(a25,26).
doAt(endflow,28).
doAt(a24,31).
doAt(a17,32).
doAt(a20,33).
doAt(a12,34).
doAt(a13,35).
doAt(a1,36).
doAt(a8,37).
doAt(a25,39).
doAt(endflow,40).
doAt(a9,42).
doAt(a3,43).
doAt(a5,44).
doAt(a25,46).
doAt(endflow,47).
doAt(a10,49).
doAt(a4,50).
doAt(a25,52).
doAt(endflow,53).
compAt(a15,x21,7).
compAt(a6,x20,18).
compAt(a6,x12,27).
compAt(a25,x3,30).
subsAt(a6,10).
subsAt(a25,12).
subsAt(a25,25).
subsAt(a25,38).
subsAt(a25,45).
subsAt(a25,51).
leftrightnexts(37,42).
leftrightnexts(36,49).
leftrightnexts(24,30).
leftrightnexts(9,16).