It's a friendly metaphor, not real coffee. Each "coffee" is €5 and you can buy as many you like.
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About David
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Acabo de añadir un artículo sobre el cifrado asimétrico a mi web, pasen a ver!! Cualquier cambio o corrección sois libres de aportarlas en mi github 🙂 https://www.davidrgfoss.com/blog/Cifrado%20asimetrico
