With no explanation, label each line with "O", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
Porter
family
was
of
the
professional
middle
class
and
employed
a
servant
until
the
First
World
War
.
The:O
Porter:O
family:O
was:O
of:O
the:O
professional:O
middle:O
class:O
and:O
employed:O
a:O
servant:O
until:O
the:O
First:event-attack/battle/war/militaryconflict
World:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
.:O