In https://chemrxiv.org/engage/chemrxiv/article-details/60c75885ee301ce974c7b74e https://chemrxiv.org/engage/chemrxiv/article-details/60c7588..., they find the

In https://chemrxiv.org/engage/chemrxiv/article-details/60c75885ee301ce974c7b74e https://chemrxiv.org/engage/chemrxiv/article-details/60c7588..., they find the common nucleobases are found earlier in enumeration, so you might expect most life use it