With no explanation, label each line with "O", "event-protest", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Also
,
the
area
was
one
of
the
places
where
the
Wallachian
Revolution
of
1848
unfolded
.
Also:O
,:O
the:O
area:O
was:O
one:O
of:O
the:O
places:O
where:O
the:O
Wallachian:event-protest
Revolution:event-protest
of:O
1848:O
unfolded:O
.:O