With no explanation, label each line with "O", "building-hospital", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hotel" preceded by ":".
He
headed
the
board
of
the
Washington
Hospital
Center
from
1959
to
1961
.
He:O
headed:O
the:O
board:O
of:O
the:O
Washington:building-hospital
Hospital:building-hospital
Center:building-hospital
from:O
1959:O
to:O
1961:O
.:O