Task: songer_crmproc2

What follows is an opinion from a United States Court of Appeals.
Your task is to identify the second most frequently cited federal rule of criminal procedure in the headnotes to this case. Answer "0" if less than two federal rules of criminal procedure are cited. For ties, code the first rule cited.

PER CURIAM.
This is an appeal from an order denying a motion made under 28 U.S.C.A. § 2255 to vacate a judgment and sentence of imprisonment in a criminal case. The motion did no more than challenge the sufficiency of the proofs at the trial in which the prisoner was convicted; and it is too well settled to admit of argument that questions of this sort may not be raised by motion under 28 U.S.C.A. § 2255. Howell v. United States, 4 Cir., 172 F.2d 213, Taylor v. United States, 4 Cir., 177 F.2d 194.
Affirmed.

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

Answer: 0