Whether this Court's holding in Houston v. Lack was based on equity or the interpretation of the word filed?

QUESTION(S) PRESENTED 1. Whether this Court's holding in Houston v. Lack was based on equity or the interpretation of the word filed? 2. Whether district courts may presume a pro-se prisoner received ..’ > notice of the entry of an otder or judgment sought to be appealed under the Fed. R. Civ. P. 4(a)(6)(A)? 3. Whether district courts should be required to label correspondence to pro-se prisoners as "Legal Mail---only open in the presence of inmates" 4. Whether the ‘logic in Houston may be applied in reverse -that the time for filing a notice of appeal begins when a pro-se prisoner receives notice of an order or judgment sought to be appealed? 1 487 us. 266, 101 L. Ed. 2d 245, 108 S. Ct. 2379 (1988).