Input (grade 13): Airplane hijackings result in the collapse of the World Trade Center in New York City, destruction of the western portion of The Pentagon in Arlington, Virginia, and a passenger airliner crash in Shanksville, Pennsylvania.
Output (grade 10): Salvador Allende Events 2001 - The September 11 attacks destroy the World Trade Center in New York City and part of The Pentagon in Washington, D.C., and down a passenger airliner in Pennsylvania.