Title: Opcional

Text: At first, this design doesn't sound so remarkable. After all, you already have a keyboard, and you can tell when you've pressed a key: You push one down, and a letter pops up on the screen. Take a second, however, to think about how you know you've pressed a key - it's probably because you've pushed the key down as far as it will go, only after which do you see something happen on your PC. Cada párrafo será una prueba.

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