Task: songer_civproc1

What follows is an opinion from a United States Court of Appeals.
Your task is to identify the most frequently cited federal rule of civil procedure in the headnotes to this case. Answer "0" if no federal rules of civil procedure are cited. For ties, code the first rule cited.

PER CURIAM.
This is a suit under R.S. § 4915, 35 U.S. C.A. § 63, to obtain a patent on a snap-on cover for a container. In our opinion the finding of the trial court that the claims do not show invention over the prior art is consistent with the evidence. The judgment dismissing the complaint is therefore affirmed. Abbott v. Coe, 71 App.D.C. 195, 109 F.2d 449.

Question: What is the most frequently cited federal rule of civil procedure in the headnotes to this case? Answer with a number.
Answer:

Answer: 0