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 ":".
It
then
heads
northwest
where
it
overlaps
US
18
for
.
It:O
then:O
heads:O
northwest:O
where:O
it:O
overlaps:O
US:O
18:O
for:O
.:O