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<p>
Sometimes it is useful to pattern match on multiple values at the same time in
one case expression.
</p>
<p>
To do this you can give multiple subjects and multiple patterns, separated by
commas.
</p>
<p>
When matching on multiple subjects there must be the same number of patterns
as there are subjects. Try removing one of the <code>_,</code> sub-patterns to
see the compile time error that is returned.
</p>
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