49   dna_->intToChar(state);
    57   int i = dna_->charToInt(state);
    58   return rna_->intToChar(i);
    65   rna_->intToChar(state);
    73   int i = rna_->charToInt(state);
    74   return dna_->intToChar(i);
 An alphabet exception thrown when trying to specify a bad char to the alphabet. 
int reverse(int state) const
Translate a given state coded as a int from target alphabet to source alphabet. 
This alphabet is used to deal NumericAlphabet. 
int translate(int state) const
Translate a given state coded as a int from source alphabet to target alphabet. 
An alphabet exception thrown when trying to specify a bad int to the alphabet.