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(15,20).
next(20,21).
next(21,22).
next(22,23).
next(12,24).
next(24,25).
next(25,26).
next(26,27).
next(27,28).
next(28,29).
next(29,30).
next(30,31).
next(31,32).
next(28,33).
next(33,34).
next(34,35).
next(35,36).
next(9,37).
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(46,47).
next(47,48).
next(48,49).
next(45,50).
next(50,51).
next(51,52).
next(52,53).
next(42,54).
next(54,55).
next(55,56).
next(56,57).
next(57,58).
next(58,59).
next(59,60).
next(60,61).
next(61,62).
next(58,63).
next(63,64).
next(64,65).
next(65,66).
doAt(startflow,5).
doAt(a13,6).
doAt(a5,8).
doAt(a10,9).
doAt(a20,10).
doAt(a17,11).
doAt(a12,12).
doAt(a19,13).
doAt(a2,14).
doAt(a4,15).
doAt(a11,16).
doAt(a1,17).
doAt(endflow,18).
doAt(a3,20).
doAt(a1,21).
doAt(endflow,22).
doAt(a9,24).
doAt(a16,25).
doAt(a15,26).
doAt(a2,27).
doAt(a4,28).
doAt(a11,29).
doAt(a1,30).
doAt(endflow,31).
doAt(a3,33).
doAt(a1,34).
doAt(endflow,35).
doAt(a7,37).
doAt(a8,38).
doAt(a18,39).
doAt(a14,40).
doAt(a17,41).
doAt(a12,42).
doAt(a19,43).
doAt(a2,44).
doAt(a4,45).
doAt(a11,46).
doAt(a1,47).
doAt(endflow,48).
doAt(a3,50).
doAt(a1,51).
doAt(endflow,52).
doAt(a9,54).
doAt(a16,55).
doAt(a15,56).
doAt(a2,57).
doAt(a4,58).
doAt(a11,59).
doAt(a1,60).
doAt(endflow,61).
doAt(a3,63).
doAt(a1,64).
doAt(endflow,65).
subsAt(a5,7).
leftrightnexts(16,20).
leftrightnexts(29,33).
leftrightnexts(13,24).
leftrightnexts(46,50).
leftrightnexts(59,63).
leftrightnexts(43,54).
leftrightnexts(10,37).