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<br />Dealing With Uncertainty <br /> <br />· liAs we know, there are known knowns. These <br />are things we know". <br /> <br />· iiWe also know there are known unknowns. <br />That is to say, we know there are some things we <br />do not know". <br /> <br />· iiBut there are also unknown unknowns the <br />ones we don't know we don't know." <br /> <br />· Donald Rumsfeld, 2004 (heoughlloknow) <br />