pos. time athlete country venue date
pos .
time
athlete
country
venue
date
number
first second first_number second_number
number parsed year month day
number number(number) text text text date
1 12.21 (+0.7) yordanka donkova bulgaria stara zagora 20 august 1988
how many countries have at least one athlete who ranks in the top 25 ?
WRB JJ NNS VBD-AUX IN JJS CD NN WP VBZ IN DT JJ CD .
11
select count ( distinct c4 ) from w