Not later than ten (10) days prior to the hearing, unless otherwise ordered by the Presiding Officer, the parties may simultaneously serve and file prehearing briefs which should set forth:

(a) A statement of the facts expected to be proved and of the anticipated order of proof;

(b) A statement of the issues and the legal arguments in support of the party's contentions with respect to each issue; and

(c) A table of authorities relied upon.