A party who has filed a brief and who has timely requested oral argument may argue the case to the court unless the court, after examining the briefs, decides that oral argument is unnecessary for any of the following reasons:
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(a) the appeal is frivolous;
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(b) the dispositive issue or issues have been authoritatively decided;
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(c) the facts and legal arguments are adequately presented in the briefs and record; or
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(d) the decisional process would not be significantly aided by oral argument.