rank swimmer country time note
rank
swimmer
country
time
note
number
number min sec
number text text time text
1 claudia poll costa rica 1:00.45 q
how many competitors did not start the preliminaries ?
WRB JJ NNS VBD-AUX RB VB DT NNS .
4
select count ( c2 ) from w where c1 is null