Towards more picturesque speech
SEC guidance on plain EnglishIndex: Click to expand:
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Or” is a logical operation which gives the value one if at least one operand has the value one, and otherwise gives a value of zero.

It follows, therefore, that an or statement may be true even if both the operands have a value of one, and you don’t need that outrageous desecration of the English language, “and/or”.

See also