With no explanation, label each line with "location-GPE", "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
As
the
U.S.
3rd
Infantry
Division
advanced
northwards
to
Baghdad
,
they
avoided
getting
bogged
down
in
urban
combat
by
bypassing
heavily
defended
Iraqi
towns
.
As:O
the:O
U.S.:organization-other
3rd:organization-other
Infantry:organization-other
Division:organization-other
advanced:O
northwards:O
to:O
Baghdad:location-GPE
,:O
they:O
avoided:O
getting:O
bogged:O
down:O
in:O
urban:O
combat:O
by:O
bypassing:O
heavily:O
defended:O
Iraqi:O
towns:O
.:O