Give two new examples of contexts in which:
1. Stating an A proposition does not seem to commit the speaker to the existence of the things to which the subject term refers.
2. Stating an A proposition does not seem to commit the speaker to the existence of the things to which the predicate term refers.
3. Stating an E proposition does not seem to commit the speaker to the existence of the things to which the subject term refers.
4. Stating an E proposition does not seem to commit the speaker to the existence of the things to which the predicate term refers.