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The intersection of bodies A and B is that volume which is in both bodies. It is described as +A +B, A +B, or A B. The intersection +A -B or A -B describes the space that is within body A and also outside of body B. A zone that is described with only a list of signed bodies is known as a simple zone. Parentheses can be used in the description of simple zones for convenience; parentheses do not alter the meaning of a (body-based) zone description in Sabrina.