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 ":".
Although
Sun
Jian
initially
outmaneuvered
and
outfought
Liu
Biao
,
he
was
killed
in
action
and
his
army
forced
to
retreat
.
Although:O
Sun:person-politician
Jian:person-politician
initially:O
outmaneuvered:O
and:O
outfought:O
Liu:person-politician
Biao:person-politician
,:O
he:O
was:O
killed:O
in:O
action:O
and:O
his:O
army:O
forced:O
to:O
retreat:O
.:O