flight date payload nickname payload orbit result
flight
date
payload nickname
payload
orbit
result
first second
number parsed year month day
first second
text(text) date text text(text) text text
tf1 (test flight) february 4, 1994 ryusei orex (orbital re-entry experiment) leo success
how many at most flights were canceled according to the chart ?
WRB JJ IN JJS NNS VBD-AUX VBN VBG TO DT NN .
1
select count ( distinct c1 ) from w where c6 = 'canceled'