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 ":".
Just
after
that
it
crosses
under
Amtrak
's
Northeast
Corridor
.
Just:O
after:O
that:O
it:O
crosses:O
under:O
Amtrak:O
's:O
Northeast:O
Corridor:O
.:O