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Nonzero-length arrays are mutable. Declaring one `public static final` indicates
that the developer expects it to be a constant, which is not the case. Making it
`public` is especially dangerous since clients of this code can modify the
contents of the array.
There are two ways to fix this problem:
1. Refactor the array to an `ImmutableList`.
2. Make the array `private` and add a `public` method that returns a copy of
the `private` array.
See Effective Java 3rd Edition, Item 15, for more details.
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