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(8,13).
next(13,14).
next(14,15).
next(15,16).
next(16,17).
next(13,18).
next(18,19).
next(19,20).
next(20,21).
next(21,22).
next(19,23).
next(23,24).
next(24,25).
next(25,26).
next(26,27).
next(27,28).
next(28,29).
next(26,30).
next(30,31).
next(31,32).
next(32,33).
next(30,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(38,39).
next(39,40).
next(37,41).
next(41,42).
next(42,43).
next(43,44).
next(44,45).
next(42,46).
next(46,47).
next(47,48).
next(48,49).
next(49,50).
next(50,51).
next(51,52).
next(49,53).
next(53,54).
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(62,63).
next(63,64).
next(41,65).
next(65,66).
next(66,67).
doAt(startflow,3).
doAt(a6,4).
doAt(a23,5).
doAt(a17,6).
doAt(a45,7).
doAt(a21,8).
doAt(a36,9).
doAt(a27,10).
doAt(endflow,11).
doAt(a33,13).
doAt(a39,14).
doAt(a35,15).
doAt(endflow,16).
doAt(a2,18).
doAt(a44,19).
doAt(a30,20).
doAt(endflow,21).
doAt(a3,23).
doAt(a20,24).
doAt(a5,25).
doAt(a16,26).
doAt(a1,27).
doAt(endflow,28).
doAt(a12,30).
doAt(a11,31).
doAt(endflow,32).
doAt(a10,34).
doAt(a22,35).
doAt(a19,36).
doAt(a15,37).
doAt(a25,38).
doAt(endflow,39).
doAt(a28,41).
doAt(a34,42).
doAt(a24,43).
doAt(endflow,44).
doAt(a41,46).
doAt(a29,47).
doAt(a8,48).
doAt(a13,49).
doAt(a26,50).
doAt(endflow,51).
doAt(a31,53).
doAt(a14,54).
doAt(a38,55).
doAt(a40,56).
doAt(a4,57).
doAt(a37,58).
doAt(a42,59).
doAt(a18,60).
doAt(a43,61).
doAt(a9,62).
doAt(endflow,63).
doAt(a7,65).
doAt(endflow,66).
leftrightnexts(50,53).
leftrightnexts(43,46).
leftrightnexts(42,65).
leftrightnexts(38,41).
leftrightnexts(31,34).
leftrightnexts(27,30).
leftrightnexts(20,23).
leftrightnexts(14,18).
leftrightnexts(9,13).