Input (grade 12): 1986 & ndash; The Soviet passenger liner sinks in the Black Sea after colliding with the bulk carrier Pyotr Vasev, killing 423.
Output (grade 10): 1986 - An Aeroméxico Douglas DC-9 collides with a Piper PA-28 over Cerritos, California, killing 67 in the air and 15 on the ground.