With no explanation, label each line with "O", "person-athlete", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
After
knocking
down
Cardenas
twice
in
the
2nd
round
,
Farenas
landed
a
vicious
low
blow
in
round
3
.
After:O
knocking:O
down:O
Cardenas:person-athlete
twice:O
in:O
the:O
2nd:O
round:O
,:O
Farenas:person-athlete
landed:O
a:O
vicious:O
low:O
blow:O
in:O
round:O
3:O
.:O