Define ambiguity in Context-Free Grammar (CFG). Prove that the following grammar is ambiguous.

Ambiguity in the context of Context-Free Grammars (CFG) refers to a situation where a grammar can derive more than one parse tree for a particular string. This means that a given string can have multiple interpretations or meanings within the grammar. Ambiguity can arise due to various reasons such as the presence of ambiguous production rules or the structure of the grammar itself.

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