(a) Single Justice. In addition to the authority expressly conferred by these rules or by law, a single justice or judge of an appellate court may grant or deny a request for relief that these rules allow to be sought by motion. But in a civil case, a single justice should not do the following:
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(1) act on a petition for an extraordinary writ; or
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(2) dismiss or otherwise determine an appeal or a motion for rehearing or en banc reconsideration.
(b) Panel. An appellate court may provide, by order or rule, that a panel or the full court must act on any motion or class of motions.