Question: Consider a domain where the word coffee can refer to the following concepts in a knowledge-base: a caffeinated or decaffeinated beverage, ground coffee used to make either kind of beverage, and the beans themselves. Give arguments as to which of the following uses of coffee are ambiguous and which are vague.
a. I've had my coffee for today.
b. Buy some coffee on your way home.
c. Please grind some more coffee.