next(1,2).
next(2,3).
next(3,4).
next(4,5).
next(5,6).
next(6,7).
next(7,8).
next(5,9).
next(9,10).
next(10,11).
next(11,12).
next(12,13).
next(13,14).
next(14,15).
next(15,16).
next(12,17).
next(17,18).
next(18,19).
next(19,20).
next(20,21).
next(21,22).
next(22,23).
next(23,24).
next(19,25).
next(25,26).
next(26,27).
next(27,28).
next(28,29).
next(10,30).
next(30,31).
next(31,32).
next(32,33).
next(33,34).
next(34,35).
next(31,36).
next(36,37).
next(37,38).
next(38,39).
next(39,40).
next(40,41).
next(41,42).
next(42,43).
next(38,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
doAt(startflow,4).
doAt(a6,5).
doAt(a8,6).
doAt(endflow,7).
doAt(a5,9).
doAt(a4,10).
doAt(a9,11).
doAt(a14,12).
doAt(a12,13).
doAt(endflow,15).
doAt(a7,17).
doAt(a3,18).
doAt(a15,19).
doAt(a11,20).
doAt(a13,22).
doAt(endflow,23).
doAt(a1,25).
doAt(a13,27).
doAt(endflow,28).
doAt(a10,30).
doAt(a14,31).
doAt(a12,32).
doAt(endflow,34).
doAt(a7,36).
doAt(a3,37).
doAt(a15,38).
doAt(a11,39).
doAt(a13,41).
doAt(endflow,42).
doAt(a1,44).
doAt(a13,46).
doAt(endflow,47).
compAt(a8,x12,14).
compAt(a8,x12,21).
compAt(a8,x12,26).
compAt(a8,x12,33).
compAt(a8,x12,40).
compAt(a8,x12,45).
leftrightnexts(20,25).
leftrightnexts(13,17).
leftrightnexts(39,44).
leftrightnexts(32,36).
leftrightnexts(11,30).
leftrightnexts(6,9).