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 ":".
In
2002
a
new
unit
to
cater
for
boys
aged
between
fourteen
and
sixteen
years
was
built
but
up
until
2004
this
had
not
been
used
.
In:O
2002:O
a:O
new:O
unit:O
to:O
cater:O
for:O
boys:O
aged:O
between:O
fourteen:O
and:O
sixteen:O
years:O
was:O
built:O
but:O
up:O
until:O
2004:O
this:O
had:O
not:O
been:O
used:O
.:O