With no explanation, label each line with "building-other", "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
third
series
was
set
in
Dover
Castle
and
was
still
presented
by
Keith
Chegwin
.
The:O
third:O
series:O
was:O
set:O
in:O
Dover:building-other
Castle:building-other
and:O
was:O
still:O
presented:O
by:O
Keith:person-other
Chegwin:person-other
.:O