Coffee is a popular drink brewed from roasted coffee beans, known to contain caffeine.
Coffee, assuming it is filtered, is a variety of substances dissolved in water, therefore, it is a homogeneous mixture, or a solution.
Coffee is a drink brewed from roasted coffee beans.
When combined, the sentences 'Coffee is a popular drink' and 'Coffee is known to contain caffeine' can be rewritten as: Although coffee is a popular drink, it is known to contain caffeine.
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