A well known fact. Look up “duons” for more evidence of tertiary “codes” found in the genetic structures.
For more fun look up “codon wobble” and “degenerate codons”
There is also the element of time involved because some of the genetic code has to be opened up and available during the transciption activity and at the correct spatial position.
Oh, yeah...forgot...the system must have evolved by time and chance due to “random” mutations....but stone arrowheads found in a stream didn’t.
Nope, that’s a completely different thing.
https://www.sci.news/genetics/science-duons-code-dna-01618.html