Why an extra comma matters
Proponents of the Oxford comma argue it’s necessary to avoid potential ambiguity.
In the example sentence, it’s clear I like three types of food in and of themselves. Remove it and the sentence reads, “I like cake, pizza and ice cream” — leading to the potential to read the last two items as one combination item. I no longer like pizza and ice cream on their own, one could argue; I like pizza and ice cream only when they’re together. (Not that there’s anything wrong with that.)
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