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
population
were
still
living
in
tents
or
huts
three
years
later
.
The:O
population:O
were:O
still:O
living:O
in:O
tents:O
or:O
huts:O
three:O
years:O
later:O
.:O