Paul SuttonI would take a look at DNA as there are 4 nucleobases
Adenine (A)
Thymine (T)A
Guamine (G)
Cytozine (C)
However they can only form specific pairs such as
G-C or C-G
and
A-T or T-A
Bonds are Hydrogen
I have cc'd @freemo in as he may be able to expand further,
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