With no explanation, label each line with "location-GPE", "O", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
During
Ghazan
's
fight
with
Baydu
for
the
throne
in
1295
,
Chupan
met
with
him
near
the
Ustunavand
castle
and
changed
sides
.
During:O
Ghazan:person-politician
's:O
fight:O
with:O
Baydu:person-politician
for:O
the:O
throne:O
in:O
1295:O
,:O
Chupan:person-politician
met:O
with:O
him:O
near:O
the:O
Ustunavand:location-GPE
castle:location-GPE
and:O
changed:O
sides:O
.:O