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 ":".
Aurora
mayor
Fred
O
.
Aurora:location-GPE
mayor:O
Fred:O
O:O
.:O