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To signal an emergency， use the rule of three； 3 shouts， 3 horn blasts， or 3 whistles.

The concept of computational efficiency is central to the design of learning algorithms.

Escribir es un acto de amor hacia la humanidad.

The more you learn, the more you know, the more you know, the more you forget. The more you forget, the less you know. So why bother to learn?