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 ":".
In
the
third
lunar
month
of
1644
,
rebel
forces
led
by
Li
Zicheng
captured
the
Ming
capital
Beijing
and
the
Chongzhen
Emperor
committed
suicide
.
In:O
the:O
third:O
lunar:O
month:O
of:O
1644:O
,:O
rebel:O
forces:O
led:O
by:O
Li:person-politician
Zicheng:person-politician
captured:O
the:O
Ming:O
capital:O
Beijing:location-GPE
and:O
the:O
Chongzhen:person-politician
Emperor:person-politician
committed:O
suicide:O
.:O