What follows is an opinion from a United States Court of Appeals.
Intervenors who participated as parties at the courts of appeals should be counted as either appellants or respondents when it can be determined whose position they supported. For example, if there were two plaintiffs who lost in district court, appealed, and were joined by four intervenors who also asked the court of appeals to reverse the district court, the number of appellants should be coded as six.
Your task is to determine or not there was any amicus participation before the court of appeals.

Opinion:
V. E. B. CARL ZEISS, JENA, Steelmasters, Inc. and Ercona Corporation, Appellants, v. Ramsey CLARK, Acting Attorney General of the United States, Appellee.
No. 20351.
United States Court of Appeals District of Columbia Circuit.
Argued Feb. 14, 1967.
Decided May 8, 1967.
Certiorari Denied Nov. 13, 1967.
See 88 S.Ct. 334.
Mr. Harry I. Rand, Washington, D. C., for appellants.
Mr. John C. Eldridge, Atty., Dept, of Justice, with whom Messrs. David G. Bress, U. S. Atty., and Alan S. Rosenthal, Atty., Dept, of Justice, were on the brief, for appellee.
Before Edgerton, Senior Circuit Judge, and Burger and Wright, Circuit Judges.
JUDGMENT
PER CURIAM.
This cause came on to be heard on the record on appeal from the United States District Court for the District of Columbia, and was argued by counsel.
On consideration whereof it is ordered and adjudged by this Court that the order of the District Court, appealed from in this cause be, and it is hereby, affirmed for the reasons stated in Carl Zeiss Stiftung v. V. E. B. Carl Zeiss, Jena, D.D.C., 40 F.R.D. 318 (1966).

Question: Was there any amicus participation before the court of appeals?

Choices:
no amicus participation on either side
1 separate amicus brief was filed
2 separate amicus briefs were filed
3 separate amicus briefs were filed
4 separate amicus briefs were filed
5 separate amicus briefs were filed
6 separate amicus briefs were filed
7 separate amicus briefs were filed
8 or more separate amicus briefs were filed
not ascertained

Answer: 0