Question: Let = {{, }}. Prove that C = { x | x {{, }}* and in x every { is matched later in x to

Let = {{, }}. Prove that C = { x | x {{, }}* and in x every { is matched later in x to a } } is not regular. This is the language of matching parentheses. Examples are: {}, {{}}, {{}{}}, {{{}}{{}{}}}

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