\(\hat{A}\) \hat{A} \(\widehat{A}\) \widehat{A} \(\tilde{A}\) \tilde{A} \(\widetilde{A}\) \widetilde{A} \(\overline{A}\) \overline{A} \(\underline{A}\) \underline{A} \(\overbrace{A}\) \overbrace{A} \(\underbrace
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