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(6,13).
next(13,14).
next(14,15).
next(15,16).
next(16,17).
next(17,18).
next(4,19).
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(30,37).
next(37,38).
next(38,39).
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(a18,4).
doAt(a9,5).
doAt(a19,6).
doAt(a21,7).
doAt(a12,8).
doAt(a11,9).
doAt(a14,10).
doAt(endflow,11).
doAt(a5,13).
doAt(a12,14).
doAt(a11,15).
doAt(a14,16).
doAt(endflow,17).
doAt(a22,19).
doAt(a3,20).
doAt(a20,21).
doAt(a17,22).
doAt(a13,23).
doAt(a10,24).
doAt(a12,25).
doAt(a11,26).
doAt(a14,27).
doAt(endflow,28).
doAt(a2,30).
doAt(a1,31).
doAt(a12,32).
doAt(a11,33).
doAt(a14,34).
doAt(endflow,35).
doAt(a16,37).
doAt(a8,38).
doAt(a23,39).
doAt(a6,40).
doAt(a7,41).
doAt(a12,42).
doAt(a11,43).
doAt(a14,44).
doAt(endflow,45).
doAt(a15,47).
doAt(a4,48).
doAt(a24,49).
doAt(a12,50).
doAt(a11,51).
doAt(a14,52).
doAt(endflow,53).
leftrightnexts(7,13).
leftrightnexts(41,47).
leftrightnexts(31,37).
leftrightnexts(24,30).
leftrightnexts(5,19).