With no explanation, label each line with "location-GPE", "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Polaris
flees
to
Keystone
City
.
Polaris:person-other
flees:O
to:O
Keystone:location-GPE
City:location-GPE
.:O