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The CD disc

In before someone complains that I write “CLI interface”, “CD disc” etc even though that would expand to “command line interface interface”, “compact disc disc” etc, let me introduce you to the life-changing magic of lexicalization. An abbreviation can become a word of its own. And if we can’t use the words as they are without having to mentally “expand” them, we lose a lot of the benefit of having the words in the first place.