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 ":".
On
13
June
,
the
submarine
came
under
intense
attack
by
an
unknown
corvette
,
suffering
damage
significant
enough
to
be
ordered
home
.
On:O
13:O
June:O
,:O
the:O
submarine:O
came:O
under:O
intense:O
attack:O
by:O
an:O
unknown:O
corvette:O
,:O
suffering:O
damage:O
significant:O
enough:O
to:O
be:O
ordered:O
home:O
.:O