GE does not work with a natural tree representation  It runs the evolution on binary strings Genotype – phenotype mapping 1.Binary string is translated into a sequence of integers (codons) Each codon specifies the production rule to be applied for currently expanded non-terminal choice = codon MOD number_of_rules 3.Mapping finishes as all of the N have been expanded Multiple codon values can select the same rule Useful redundancy in genetic code !!.
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