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References in classic literature ?
I know for a fact that the Presidente himself expressed the desire to the management that Luis Cervallos should have that box.
Before the murder of poor Dicky Vanderpole, we know for a fact that a great nation who chooses to consider herself our enemy in Eastern waters was straining every nerve to prepare for war.
An' I know for a fact that he keeps a keg in the house all the time as well.