Input (grade 5): Although the town was well prepared for earthquakes and tsunamis and had a 6.5 metre high seawall, it was not enough and more than 80% of 8,000 houses were swept away.
Output (grade 2): The city had a 6.5 meter high seawall, but it was not enough. More than 80% of 8,000 houses were destroyed by the tsunami.