A Party may submit a brief to the Presiding Officer within such time as the Presiding Officer shall specify. A Party which desires additional time in which to file a brief may request an extension by written motion within the period specified. Each Party who files a brief shall submit two copies to the Presiding Officer, except where a different number is permitted or directed by the Presiding Officer, and shall serve one copy on all other Parties.
211 CMR, § 91.10