And / Or

The legal phrase "and/or," indicating that you can either choose between two alternatives or choose both of  them, has proved irresistible inother contexts and is now widely acceptable though it irritates somereaders as jargon. However, you can logically use it only when you are discussing choices which may or may not both be done: "Bring chipsand/or beer." It's very much overused where simple "or" would do, and itwould be wrong to say, "you can get to the campus for this morning'smeeting on a bike and/or in a car." Choosing one eliminates the possibility of the other, so this isn't an and/or situation.

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