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There are four types of [[unknown]] | There are ''four'' types of [[unknown]]. The [[Donald Rumsfeld|Rumsfeld]] ''three'': | ||
*'''[[Known known|Known knowns]]''': Things you know you know; | *'''[[Known known|Known knowns]]''': Things you know you know; | ||
*'''[[Known unknown|Known unknowns]]''': Things you know you don’t know; | *'''[[Known unknown|Known unknowns]]''': Things you know you don’t know; |