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In the sentence: The detonator for a nuclear device may be made of_____:

A) two pieces of equipment
B) two equipment pieces

I strongly feel that the correct option is A. But why? When should I use of; and when should I omit it?

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I'm afraid this is just a case of learning the different sorts of usage. There's nothing analytically wrong with equipment pieces, much as we can say "slice of cake" or "cake slice". We just don't say equipment piece(s). It's always piece(s) of equipment.

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