When you have coordinate adjectives, which are adjectives that equally describe a noun and can be separated by a conjunction ("and"), you typically place a comma between them. For example, in the phrase "The tall, dark man," the adjectives "tall" and "dark" are coordinate adjectives, and the comma separates them.
If you're looking for a specific option to place between coordinate adjectives, the answer is a comma (or "and" in some cases if not using a comma).
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