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
two
have
historically
been
considered
two
varieties
of
one
language
.
The:O
two:O
have:O
historically:O
been:O
considered:O
two:O
varieties:O
of:O
one:O
language:O
.:O