 Complete the following phrase:  At the 2012 Summer Olympics in London, she again broke her American record and set an Olympic record with a time of 56.25 seconds in her 100-meter butterfly qualifying heat. In the 100-meter butterfly final, she won the gold medal and set a new world record with her time of 55.98. Vollmer also competed in the 4×200-meter freestyle relay. She swam the second leg with a time of 1:56.02, as the U.S. team won gold with a time of 7:42.92. In her final event, the 