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(14,20).
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(24,30).
next(30,31).
next(31,32).
next(32,33).
next(33,34).
next(34,35).
next(30,36).
next(36,37).
next(37,38).
next(38,39).
next(39,40).
next(40,41).
next(41,42).
next(42,43).
next(43,44).
next(39,45).
next(45,46).
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(55,56).
doAt(startflow,7).
doAt(a13,10).
doAt(a9,12).
doAt(a7,14).
doAt(a14,15).
doAt(a17,17).
doAt(endflow,18).
doAt(a8,20).
doAt(a15,21).
doAt(a19,22).
doAt(a21,24).
doAt(a6,25).
doAt(a17,26).
doAt(endflow,28).
doAt(a22,30).
doAt(a20,31).
doAt(a17,32).
doAt(endflow,34).
doAt(a23,36).
doAt(a25,37).
doAt(a11,39).
doAt(a2,40).
doAt(a17,41).
doAt(endflow,43).
doAt(a5,45).
doAt(a3,46).
doAt(a4,47).
doAt(a12,48).
doAt(a1,49).
doAt(a10,50).
doAt(a18,51).
doAt(a16,52).
doAt(a17,53).
doAt(endflow,55).
compAt(a14,x9,9).
compAt(a17,x21,13).
compAt(a17,x17,16).
compAt(a14,x3,23).
compAt(a14,x13,27).
compAt(a14,x13,33).
compAt(a17,x12,38).
compAt(a14,x13,42).
compAt(a14,x13,54).
subsAt(a13,8).
subsAt(a9,11).
leftrightnexts(40,45).
leftrightnexts(31,36).
leftrightnexts(25,30).
leftrightnexts(15,20).