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.

HIGH TECH GAYS; Timothy Dooling, and all others similarly situated; Joel Crawford; and Robert Weston, Plaintiffs-Appellees, v. DEFENSE INDUSTRIAL SECURITY CLEARANCE OFFICE; Director, Defense Industrial Security Clearance Office; Defense Investigative Service; Director of Defense Investigative Service; Secretary of Defense, Defendants-Appellants.
No. 87-2987.
United States Court of Appeals, Ninth Circuit.
July 23, 1990.
Before BRUNETTI and LEAVY, Circuit Judges.
ORDER
The panel has voted to deny the petition for rehearing and to reject the suggestion for a rehearing en banc.
The full court has been advised of the suggestion for en banc rehearing, and a majority of the judges of the court has voted against it. Fed.R.App.P. 35(b).
The petition for rehearing is denied and the suggestion for a rehearing en banc is rejected.

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

Answer: