rank name nationality time
rank
name
nationality
time
number
number min sec
number text text time
5 gustavo borges brazil 1:49.41
which nation was the only one with two top 3 finishers ?
WDT NN VBD-AUX DT JJ CD IN CD JJ CD NNS .
Brazil
select c3 from w where id <= 3 group by c3 having count ( * ) = 2