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
rail
line
was
closed
the
same
year
causing
the
population
to
slowly
decline
.
The:O
rail:O
line:O
was:O
closed:O
the:O
same:O
year:O
causing:O
the:O
population:O
to:O
slowly:O
decline:O
.:O