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 ":".
``
These
Crows
were
in
their
own
country
and
knew
it
thoroughly
.
''
``:O
These:O
Crows:O
were:O
in:O
their:O
own:O
country:O
and:O
knew:O
it:O
thoroughly:O
.:O
'':O