வார்ப்புரு:Taxobox/displayed cell/doc

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We are passed the *parent* of the taxon in question as a string.

If the string is a word (so starts with a letter), the taxon is displayable: return A.
If the string is empty, we've hit a top level taxon (e.g. "Life"): return 0.
If the taxon in question doesn't have a taxonomy/... page, the string will be "[[Template:Taxonomy/taxon-in-question]]": return X.