Input (grade 10): 1980 - The Gwangju Massacre: airborne and army troops of South Korea retake the city of Gwangju from civil militias, killing at least 207 and possibly many more.
Output (grade 11): 1980 - The Gwangju Massacre: air force and army troops of South Korea retake the city of Gwangju from civil militias, killing at least 207 and possibly many more.