to grant a petition for certiorari, but the ancillary aspects of it have changed throughout the years, and Justices have not always agreed about these aspects.

A good example is found in dueling opinions (for themselves alone, not opinions of the Court), in Rogers v. Missouri Pac. R. Co., Justice Frankfurter and Justice John Marshall Harlan II discussed their understandings of the conventions surrounding the Rule of Four. In particular, the Justices disagreed as to whether once certiorari