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If I have some balloons, a red, a blue and white, I have two balloons. If I have a red, a blue, and a white, I have three. Comma placement distinguishes number. If I have categories A, B and C, I have two categories; if A, B, and C, three.

Sorry, I don't agree with that. If you have two balloons, then you have a red and a blue-and-white one.

If you have three, you can have "a red, a blue, and a white" or you can have "a red, a blue and a white."

If you say "I have a red, a blue and white," that simply doesn't communicate at all.

MOI
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