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Punctuation to introduce a list: comma vs. colon vs. nothing
Is this use of a colon incorrect?
I wrote an application whose features included: doing this, doing that, and doing something else.
If so, why? Is it because what precedes a colon must always be a complete sentence, or because—from Strunk & White—a colon should not separate a verb from its complement, or a preposition from its object? Or both?
Am I correct that the correct form would be simply
I wrote an application whose features included doing this, doing that, and doing something else.
Or even
I wrote an application that had many features: doing this, doing that, and doing something else.