id = 166
number = 50
visible = True
facts = None

solution = '''\
number_proper --> digit166.
number_proper --> nzdigit166, num_next166.

num_next166 --> digit166.
num_next166 --> digit166, num_next166.

digit166 --> ([0] ; [1] ; [2] ; [3] ; [4] ; [5] ; [6] ; [7] ; [8] ; [9]).
nzdigit166 --> ([1] ; [2] ; [3] ; [4] ; [5] ; [6] ; [7] ; [8] ; [9]).
'''