With no explanation, label each line with "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Maria
Severina
learned
to
play
chess
at
the
age
of
four
.
Maria:person-other
Severina:person-other
learned:O
to:O
play:O
chess:O
at:O
the:O
age:O
of:O
four:O
.:O