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(4,11).
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(13,20).
next(20,21).
next(21,22).
next(22,23).
next(23,24).
next(24,25).
next(25,26).
next(26,27).
next(21,28).
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(32,39).
next(39,40).
next(40,41).
next(41,42).
next(42,43).
next(43,44).
next(44,45).
next(45,46).
next(40,47).
next(47,48).
next(48,49).
next(49,50).
next(50,51).
next(51,52).
next(52,53).
next(53,54).
doAt(startflow,3).
doAt(a10,4).
doAt(a15,5).
doAt(a20,6).
doAt(a13,7).
doAt(a19,8).
doAt(endflow,9).
doAt(a3,11).
doAt(a17,12).
doAt(a11,13).
doAt(a24,14).
doAt(a20,15).
doAt(a13,16).
doAt(a19,17).
doAt(endflow,18).
doAt(a1,20).
doAt(a9,21).
doAt(a18,22).
doAt(a20,23).
doAt(a13,24).
doAt(a19,25).
doAt(endflow,26).
doAt(a6,28).
doAt(a5,29).
doAt(a25,30).
doAt(a14,31).
doAt(a21,32).
doAt(a8,33).
doAt(a20,34).
doAt(a13,35).
doAt(a19,36).
doAt(endflow,37).
doAt(a22,39).
doAt(a7,40).
doAt(a16,41).
doAt(a20,42).
doAt(a13,43).
doAt(a19,44).
doAt(endflow,45).
doAt(a2,47).
doAt(a4,48).
doAt(a23,49).
doAt(a20,50).
doAt(a13,51).
doAt(a19,52).
doAt(endflow,53).
leftrightnexts(41,47).
leftrightnexts(33,39).
leftrightnexts(22,28).
leftrightnexts(14,20).
leftrightnexts(5,11).