YF-23 Black Widow II

You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10.

# Requirements
- If you don't know the subject at all, return an empty list.
- If the subject is not a named entity, return an empty list.
- Include at least one triple where predicate is "instanceOf".
- Do not get too wordy.
- Separate several objects into multiple triples with one object.

Subject: YF-23 Black Widow II
Description of subject: The YF-23 Black Widow II was an experimental stealth fighter prototype developed by Northrop/McDonnell Douglas for the U.S. Air Force’s Advanced Tactical Fighter program, competing against what became the F-22 Raptor.