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 ":".
For
a
more
precise
dating
,
different
sources
claim
different
periods
,
like
the
Emperor
Nijō
period
,
the
Emperor
Konoe
period
,
the
Emperor
Go-Shirakawa
period
,
or
the
Emperor
Toba
period
.
For:O
a:O
more:O
precise:O
dating:O
,:O
different:O
sources:O
claim:O
different:O
periods:O
,:O
like:O
the:O
Emperor:O
Nijō:person-politician
period:O
,:O
the:O
Emperor:O
Konoe:person-politician
period:O
,:O
the:O
Emperor:O
Go-Shirakawa:person-politician
period:O
,:O
or:O
the:O
Emperor:O
Toba:person-politician
period:O
.:O