(a) Submissions must be made to the Trademark Trial and Appeal Board via ESTTA. (1) Text in an electronic submission must be filed in at least 11-point type and double-spaced. (2) Exhibits pertaining to an electronic submission must be made electronically as an attachment to the submission and must be clear and legible. (b) In the event that ESTTA is unavailable due to technical problems, or when extraordinary circumstances are present, submissions may be filed in paper form. All submissions in paper