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
trains
were
first
approved
for
passenger
service
in
July
2019
and
were
expected
to
enter
passenger
service
in
late
2019
.
The:O
trains:O
were:O
first:O
approved:O
for:O
passenger:O
service:O
in:O
July:O
2019:O
and:O
were:O
expected:O
to:O
enter:O
passenger:O
service:O
in:O
late:O
2019:O
.:O