n=11: 851 reachable points of length <= 40, 196 classes of parallel directions
  class of alpha=2.015103: floating billiard finds 5 of the 5 (length, factor) pairs of the unfolding, none else
  class of alpha=1.974455: floating billiard finds 5 of the 5 (length, factor) pairs of the unfolding, none else
  class of alpha=0.543837: floating billiard finds 5 of the 5 (length, factor) pairs of the unfolding, none else
  class of alpha=1.094566: floating billiard finds 5 of the 5 (length, factor) pairs of the unfolding, none else
  class of alpha=0.105566: floating billiard finds 5 of the 5 (length, factor) pairs of the unfolding, none else
  class of alpha=1.285197: floating billiard finds 5 of the 5 (length, factor) pairs of the unfolding, none else
bands computed: 7020 (rays from O, both sides); largest number of segments of a simple preclosed piece: 106
odd n: in every class exactly m = 5 preclosed lengths c*lambda*sin(2j pi/n)/sin(pi/n), factors d_j = n'/gcd(n',j); classes by n': {11: 180, 1: 16}
  n'=11: factors 11,11,11,11,11  gcd 11  a quotient is n: no  classes: 180
  n'=1: factors 1,1,1,1,1  gcd 1  a quotient is n: no  classes: 16
DONE n=11 [4.9s]
