Logic

The Silent Witness

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Puzzle Context

A detective arrives at a crime scene. The victim, a wealthy merchant, has been robbed. The only witness is a parrot. The parrot repeats one phrase: "The blue coat... the blue coat..." However, the suspect lineup has three men: 1. A man in a red coat. 2. A man in a green coat. 3. A man in a black coat. The detective immediately arrests the man in the green coat. Why?