year title role network notes
year
title
role
network
notes
number
list length
number text <f,text> text text
2000 youth y2k
青春@y2k cheng shasha tvb eason chan's music video
what is the number of networks listed in the table ?
WP VBD-AUX DT NN IN NNS VBN IN DT NN .
3
select count ( distinct ( c4 ) ) from w