1. Carol was Jan's student.
2. Carol could speak Czech.
3. Jan was born in Oxford.
4. After Lenka died, Pavel lived with his aunt.
5. Jan was two years older than Pavel.
6. Pavel lived in Prague.
7. Josef didn't visit Prague between 1957 and 1995.
8. When Josef crossed the border he was in Germany.
9. Carol couldn't play in the concert.
10. Josef, Jan and Pavel all came to the concert.