n=39: 110 reachable points of length <= 14, 21 classes of parallel directions
  class of alpha=0.073215: floating billiard finds 19 of the 19 (length, factor) pairs of the unfolding, none else
  class of alpha=0.069022: floating billiard finds 19 of the 19 (length, factor) pairs of the unfolding, none else
  class of alpha=0.143157: floating billiard finds 19 of the 19 (length, factor) pairs of the unfolding, none else
  class of alpha=0.286220: floating billiard finds 19 of the 19 (length, factor) pairs of the unfolding, none else
bands computed: 3034 (rays from O, both sides); largest number of segments of a simple preclosed piece: 26
odd n: in every class exactly m = 19 preclosed lengths c*lambda*sin(2j pi/n)/sin(pi/n), factors d_j = n'/gcd(n',j); classes by n': {39: 11, 13: 4, 3: 6}
  n'=39: factors 39,39,13,39,39,13,39,39,13,39,39,13,3,39,13,39,39,13,39  gcd 1  a quotient is n: yes  classes: 11
  n'=13: factors 13,13,13,13,13,13,13,13,13,13,13,13,1,13,13,13,13,13,13  gcd 1  a quotient is n: no  classes: 4
  n'=3: factors 3,3,1,3,3,1,3,3,1,3,3,1,3,3,1,3,3,1,3  gcd 1  a quotient is n: no  classes: 6
DONE n=39 [4.3s]
