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
book
stations
were
open
half-time
,
and
serves
one-sixth
as
many
readers
as
the
branch
libraries
.
These:O
book:O
stations:O
were:O
open:O
half-time:O
,:O
and:O
serves:O
one-sixth:O
as:O
many:O
readers:O
as:O
the:O
branch:O
libraries:O
.:O