Quoth Crab
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If you have only two items, there's no comma because you don't have a pause between the items. Peanut butter and jelly.
If you have three or more, you will find that you pause slightly between each of the items, including the final two. No ifs, ands, or buts.
I've never really understood the idea of dropping the last comma in a list, except as it reduces the number of characters for printing purposes.
^-.-^

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