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spec: In a number of ways , the dialogues may be said to be works of fiction ; none of them took place exactly as presented by Plato , several could not have taken place , some contain characters who never existed . The prohibitionist campaign is an effort to give an unfair competitive advantage to one group of sellers . There are many techniques for coaxing reluctant oil from the ground ; none of them work without knowing where the oil is hiding . None of the politicians could match the eloquence of Lt. Col. Oliver North ; none of them looked as convincing to the television cameras ; none gave dramatic life to the principles at risk . Avoid freeze-thaw cycles .