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.

ORDER.
This case is before the Court upon the petition of J. C. Penney Co., Inc., to review an order of the National Labor Relations Board and upon the cross-petition of the Board to enforce the order. The decision and order of the Board are reported at 162 N.L.R.B. No. 144. The intervenor has filed a brief urging enforcement.
The Court holds that the findings of fact of the Board are supported by substantial evidence on the record considered as a whole.
It is ordered that the order of the Board be and hereby is enforced.

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