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
principal
research
focus
is
on
bird
migration
through
banding
studies
.
The:O
principal:O
research:O
focus:O
is:O
on:O
bird:O
migration:O
through:O
banding:O
studies:O
.:O