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Coincidence/Monod: the structures of the proteins are random in the sense that it is impossible to formulate any empirical rule by which the nature of the remaining building blocks can be predicted from an exact knowledge of 199 building blocks of the protein consisting of 200 building blocks.
This is not an ignorance, but a factual description.
Coincidence/genetic code/Monod: the genetic code which occurs in the whole nature, is arbitrary in that the transmission of information could take place just as well according to another agreement.
Zufall und Notwendigkeit Hamburg 1982