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The REPLiCa instruction set is about twice as big as that of the
Many of the instructions can certainly be removed without
having a great impact on the things that programs can do (e.g. the
self-replicator listed in Section A.3.1 only uses 17 different
instructions). If the genetic code were allowed to evolve, then unused
instructions might be expected to be removed from the code by natural
selection, allowing common instructions to be represented multiple