These templates are for English letters with marks (e.g. overlines) for romanization.
Since the Mediawiki software auto-capitalizes the first letter of a template name, it is not possible to make upper- and lower-case versions of template names. Ergo, all templates containing only letters (e.g. {{o}}) should contain a capitalized version, while lower-case versions should begin with an exclamation point (e.g. {{!o}}).
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