Translate the given Spanish text to English
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Question: The earplug includes a stem.

Answer: El tapón auditivo incluye un rabillo.


Question: Graphite may optionally be employed.

Answer: Opcionalmente se puede utilizar grafito.


Question: The sharpening device includes support wheels, an abrasive grinding stone and devices for its rotation.

Answer:
EL DISPOSITIVO DE AFILAR, COMPRENDE RUEDAS DE SOPORTE, MUELA ABRASIVA Y DISPOSITIVOS PARA SU GIRO.