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(19,20).
next(20,21).
next(21,22).
next(22,23).
next(20,24).
next(24,25).
next(25,26).
next(18,27).
next(27,28).
next(28,29).
next(29,30).
next(30,31).
next(31,32).
next(32,33).
next(30,34).
next(34,35).
next(35,36).
next(28,37).
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(43,47).
next(47,48).
next(48,49).
next(40,50).
next(50,51).
next(51,52).
next(52,53).
next(53,54).
next(54,55).
next(55,56).
next(56,57).
next(54,58).
next(58,59).
next(59,60).
doAt(startflow,8).
doAt(a21,10).
doAt(a4,11).
doAt(a24,13).
doAt(a8,14).
doAt(a14,15).
doAt(a17,16).
doAt(a2,17).
doAt(a6,18).
doAt(a15,19).
doAt(a1,20).
doAt(a11,21).
doAt(endflow,22).
doAt(a9,24).
doAt(endflow,25).
doAt(a22,27).
doAt(a5,28).
doAt(a25,29).
doAt(a1,30).
doAt(a11,31).
doAt(endflow,32).
doAt(a9,34).
doAt(endflow,35).
doAt(a20,37).
doAt(a16,38).
doAt(a12,39).
doAt(a18,40).
doAt(a10,41).
doAt(a19,42).
doAt(a1,43).
doAt(a11,44).
doAt(endflow,45).
doAt(a9,47).
doAt(endflow,48).
doAt(a3,50).
doAt(a7,51).
doAt(a23,52).
doAt(a19,53).
doAt(a1,54).
doAt(a11,55).
doAt(endflow,56).
doAt(a9,58).
doAt(endflow,59).
subsAt(a21,9).
subsAt(a24,12).
leftrightnexts(21,24).
leftrightnexts(31,34).
leftrightnexts(44,47).
leftrightnexts(55,58).
leftrightnexts(41,50).
leftrightnexts(29,37).
leftrightnexts(19,27).