Within fifteen (15) days after the filing of the notice of completion of the record on appeal required by Rule 1.142, the appellant shall file a Brief-in-chief. The appellee shall file the Answer Brief within fifteen (15) days after the filing of the Brief-in-chief. The appellant may file a Reply Brief within ten (10) days after the Answer Brief is filed. The briefs shall comply with Rules 1.10 and 1.11 as to form and content. See Rule 1.77(b).
Okla. Stat. tit. 12, app 1 R. 1.143