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 dinhanhthi
Owner of dinhanhthi.com and Math2IT.com
I'm a Vietnamese guy who has a curious mind. I'd like to learn something new every day. I'm a PhD in Applied Maths and currently a Data Scientist. You find in this site my notes which are taken when I've found something new in Data Science and Web Developement.
