The World Is Divided Into Two Groups. There Are Those Who Know, And Those Who Don't Know.

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The world is divided into two groups. There are those who know, and
those who don't know. Those who know, they're no problem. Those who
don't know are also in two groups. One is those who don't know, and
know they don't know. Well, they can learn! But then, there are those
who don't know, and don't know they don't know.

And they become managers!