swimming at the 2014 Summer Youth Olympics – boys' 50 metre butterfly
{'<entity_0>': 'Nanjing Olympic Sports Centre', '<entity_1>': "swimming at the 2014 Summer Youth Olympics – boys' 50 metre butterfly", '<entity_2>': 'swimming', '<entity_3>': '2014'}
[["swimming at the 2014 Summer Youth Olympics – boys' 50 metre butterfly", 'point in time', '2014'], ["swimming at the 2014 Summer Youth Olympics – boys' 50 metre butterfly", 'sport', 'swimming'], ["swimming at the 2014 Summer Youth Olympics – boys' 50 metre butterfly", 'location', 'Nanjing Olympic Sports Centre']]
The <entity_1> event in <entity_2> at the <entity_3> Summer Youth Olympics took place on 20 August and 21 August at the <entity_0> in Nanjing, China.
['sporting event']