With no explanation, label each line with "O", "person-artist/author", "organization-education", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Carl
had
studied
at
Yale
University
.
Carl:person-artist/author
had:O
studied:O
at:O
Yale:organization-education
University:organization-education
.:O