With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
withdrawal
became
a
rout
wit
h
South
Vietnam
suffering
heavy
casualties
.
The:O
withdrawal:O
became:O
a:O
rout:O
wit:O
h:location-GPE
South:location-GPE
Vietnam:location-GPE
suffering:O
heavy:O
casualties:O
.:O