Osman Kamara
He competed in the 100 m freestyle , 50 m backstroke and 50 m butterfly events at the 2012 FINA World Swimming Championships ( 25 m ) and in the 50 m freestyle and 50 m butterfly events at the 2013 World Aquatics Championships in Barcelona . 
<triplet> 2012 FINA World Swimming Championships (25 m) <subj> 2012 <obj> point in time