The Devil
IHTFP
Its quite simple bub - you choose a mapping of alphabet to a set of 3 consecutive blocks (4^3 giving you enough permutations to code the alphabet) and then encode the sequence to describe the text you want.
We covered this several pages ago. You are formulating a code, then transcribing it to DNA bases. DNA is no more a code in this instance than is a piece of paper, or a set of coloured balls.
The encoding of gentic information is just as arbitrary it just happened to be picked by evolution. I see the point you are trying to make however it is based upon an almost totally oafish misunderstanding of both encoding and genetics.
You have a strange understanding of "arbitrary". I wouldn't call any chemical reaction "arbitrary".
I have qualifications in natural computing all of which require detailed knowledge of evolutionary, genetic and neural fields.
That'll be a "no", then. It shows.