 Complete the following phrase:  Mardini was 18 years old at the time of the 2016 Olympics. On 6 August, she swam in the first round of the womens 100 meters butterfly; and won her heat in a time of 1 minute and 9.21 seconds. However, only the top 16 overall were to advance to the semifinals, and her overall ranking was 40th. Next for her was the 