Convert a heading to title case, capitalising the important words and leaving short joining words such as “a”, “the” and “of” in lower case.
the quick brown fox jumps over the lazy dog
The Quick Brown Fox Jumps Over the Lazy Dog
The usual minor words — a, an, the, and, but, or, for, nor, on, at, to, by, in, of, up, as and is — unless one of them starts the title.
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