The Sunday Challenge = The symbols of Easter
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An Easter egg is an intentional inside joke, a hidden message, or a secret feature of a computer program. The name is used to evoke the idea of a traditional Easter egg hunt. The term was coined to describe a hidden message in the Atari video game Adventure that led Atari to encourage further hidden messages in later games, treating them as Easter eggs for players to find.
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The hidden message was "str..berry"