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(or from a dictionary) to get a good assumption of the whole 
character/substring counting. There could be some ASCII characters
(e.g. 'ä' in an english text), that didn't occur. To ensure that 
the whole text is encodable, you simply set the counting of every 
character not yet counted to zero. That guarantees that
there is an encoding/decoding bit sequences for these ones.
It also guarantees that these bit sequences are longer than
all other encoding/decoding sequences of counted characters/substrings.

The countings needn't be integers,
they could also be fractions (e.g. percentage).

=item $huff->encode_hash

Returns a reference to the encoding hash.
The keys of the encoding hash are the characters/strings passed
at the construction. The values are their bit representation.
Please note that the bit represantations are strings 
of ones and zeros is returned and not binary numbers.

=item $huff->decode_hash