With no explanation, label each line with "location-GPE", "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Upon
Mantai
's
death
,
Nurhaci
aided
Bujantai
in
defeating
other
Ula
Nara
pretenders
to
regain
the
Ula
throne
.
Upon:O
Mantai:person-other
's:O
death:O
,:O
Nurhaci:person-other
aided:O
Bujantai:person-other
in:O
defeating:O
other:O
Ula:location-GPE
Nara:location-GPE
pretenders:O
to:O
regain:O
the:O
Ula:location-GPE
throne:O
.:O