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milk
They're both beans which are ground down and used as sources of food (Drink)
No. People often drink coffee before, during, and after drinking beer.
No
no
No, the coffee grounds are removed from the coffee before drinking. You do not actually drink the beans.
It may not be good for them (or for humans, for that matter), but horses have been known to drink coffee. For example, a race horse from the 1960's, Whirling Self, was known to drink black coffee from a coffee cup. He did not drink it before a race, as caffeine (like many drugs) is not allowed before races.
Do not drink it just in case
no
No
yes
yes.