test2.in   2   0 ident      'a'
test2.in   2   2 ident      'b'
test2.in   2   4 ident      'ab'
test2.in   2   7 ident      'abba'
test2.in   2  12 ident      'a0'
test2.in   3   0 ident      'b1'
test2.in   3   3 ident      'abab0110bba1'
test2.in   4   0 num        '0'
test2.in   4   2 num        '1'
test2.in   4   4 num        '00'
test2.in   4   7 num        '01'
test2.in   5   0 num        '101010'
test2.in   5   7 num        '0001010101'
test2.in   8   0 None       ''