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I doubt strongly that the first encodings were in RNA. Why make things so complex? It's only necessary to assume some very primitive and inefficient encoding. Evolution takes over from this point.

I'm sorry, but this is so vague as to be useless.

Natural selection, and therefore evolution, simply cannot begin until there is a self-replicating entity. No self-replication, no selection.

As far as your "very primitive and inefficient encoding", what doses that even mean. Either you have an entity that can semi-reliably reproduce itself (if it's not basically reliable, that's not even self-replication), or you don't. You still have not explained what sort of molecule could self-replicate.
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