Input (grade 4): The 2010 Pichilemu earthquake was a 6.9 magnitude earthquake that occurred on 11 March 2010, at 11:39 local time (14:39 UTC).
Output (grade 9): Within 6 hours, 10 aftershocks took place, of these 2 were of magnitude 6 or greater and 7 between magnitude 5 and 6.