(b) The appeal shall initially be presented to the full court on the record that was before the single justice, together with a preliminary memorandum from the appellant and, if requested, from the appellee. The appellant shall be responsible for preparing and filing a record appendix containing copies of all the relevant papers from the single justice proceeding, including but not limited to the hearing committee report, appeal panel report, if any, board of bar overseers memorandum, the order or judgment of the single justice, and any memorandum of decision of the single justice. The appellant's preliminary memorandum, which shall not exceed twenty pages, double spaced, shall set forth the relevant background and summarize the appellant's arguments on appeal, with citations to applicable authority. It is incumbent on the appellant to demonstrate in this memorandum that there has been an error of law or abuse of discretion by the single justice; that the decision is not supported by substantial evidence; that the sanction is markedly disparate from the sanctions imposed in other cases involving similar circumstances; or that for other reasons the decision will result in a substantial injustice. Nine copies of the record appendix and preliminary memorandum shall be filed with the clerk of the Supreme Judicial Court for the Commonwealth within thirty days after the appeal has been docketed in the full court; one copy of the record appendix and memorandum shall be served on each other party. In the case of multiple appellants or cross-appellants, each appellant shall be permitted to file a preliminary memorandum within this time frame, but in such a case, the appellants shall submit, and share the cost of, a single record appendix. If requested by the court, the appellee may file a responsive memorandum, not to exceed twenty pages, double spaced, within twenty days ofthe court's request. Extensions of time for filing memoranda will rarely be granted and should not be anticipated.