<hint>
The <hint> tag is optionally part of a structured <example>-like,
<project>-like, or <exercise>
when an author wants to provide some additional direction that isn’t a complete
<answer> or <solution>.
The visibility and knowling behavior of hints, answers, and solutions can be controlled separately
from the statement of the exercise, example, or project at the document level via the publication file.
Syntax
Variants
There are 2 variants of <hint>.