Take another look at the sentence:

Sick with the flu, Howard craved a big hot bowl of his grandmother's chicken soup, but in the refrigerator, Howard had only a jar of olives and a carton of milk, cream of olive soup, Howard decided, would only worsen how he felt.

There is no problem with the comma between soup and but. Howard craved a big hot bowl of his grandmother's chicken soup is a main clause. In the refrigerator, Howard had only a jar of olives ... begins another main clause. You can legally connect two main clauses with a comma and a coordinating conjunction like but.

Go back to the sentence to try again.

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