Appellant's Brief-in-chief shall be filed within thirty (30) days from the date the Notice of Completion of Record is filed in the Supreme Court. The appellee shall file an Answer Brief within twenty (20) days after the filing of the Brief-in-chief of the appellant. The appellant may file a Reply Brief within ten (10) days after the filing of the Answer Brief by appellee. The briefs must comply with the rules for briefs in Part I of these Rules to the extent that they are consistent with Rules 1.60 through 1.67 inclusive. See Rules 1.10, 1.11, 1.40(b), 1.67.
Okla. Stat. tit. 12, app 1 R. 1.65