Task: songer_usc1

What follows is an opinion from a United States Court of Appeals.
Your task is to identify the most frequently cited title of the U.S. Code in the headnotes to this case. Answer "0" if no U.S. Code titles are cited. If one or more provisions are cited, code the number of the most frequently cited title.

PER CURIAM:
Edwards seeks in this successive writ petition a certificate of probable cause and stay of execution. For the reasons stated in the district court’s opinion of June 16, 1989, we are persuaded that Edwards has not demonstrated a “substantial showing of the denial of a federal right.” Barefoot v. Estelle, 463 U.S. 880, 893, 103 S.Ct. 3383, 3394, 77 L.Ed.2d 1090 (1983).
Accordingly, the application for certificate of probable cause and stay of execution is DENIED.

Question: What is the most frequently cited title of the U.S. Code in the headnotes to this case? Answer with a number.
Answer:

Answer: 0