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A catalyst doesn't get used up in a reaction, so even if it is used up in one of the steps, it'll be regenerated in another step. Intermediates are the products of one step that are then used as reactants in a following step.
Intermediates exists to show the reaction mechanism and it cancels out if you combine the separate steps together. However, catalyst is consumed and will be regenerated in the next step, and it functions to lower the activation energy.
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