| Note | The sort key is used to determine the sequence and grouping of entries in an index. Dictionary order often differs from the collation sequence of machine-readable character
            sets; in English-language dictionaries, an entry for 4-H will often
            appear alphabetized under ‘fourh’, and McCoy may be
            alphabetized under‘maccoy’, while A1,
            A4, and A5 may all appear in numeric order
            ‘alphabetized’ between ‘a-’ and ‘AA’. The sort key is
            required if the orthography of the dictionary entry does not suffice to determine its
            location. |