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 ":".
Streams
of
teargas
forced
protesters
against
the
building
with
nowhere
to
go
.
Streams:O
of:O
teargas:O
forced:O
protesters:O
against:O
the:O
building:O
with:O
nowhere:O
to:O
go:O
.:O