With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
The
requirement
for
riding
pillion
was
quietly
dropped
as
large
numbers
of
jeeps
came
into
service
in
the
middle
of
the
war
.
The:O
requirement:O
for:O
riding:O
pillion:O
was:O
quietly:O
dropped:O
as:O
large:O
numbers:O
of:O
jeeps:O
came:O
into:O
service:O
in:O
the:O
middle:O
of:O
the:O
war:O
.:O