With no explanation, label each line with "O", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
She
formally
became
Empress
consort
(
``
chūgū
''
)
to
Emperor
Kōkaku
at
age
15
after
she
was
engaged
to
the
new
Emperor
by
former
empress
Go-Sakuramachi
.
She:O
formally:O
became:O
Empress:O
consort:O
(:O
``:O
chūgū:O
'':O
):O
to:O
Emperor:O
Kōkaku:person-politician
at:O
age:O
15:O
after:O
she:O
was:O
engaged:O
to:O
the:O
new:O
Emperor:O
by:O
former:O
empress:O
Go-Sakuramachi:person-politician
.:O