With no explanation, label each line with "O", "organization-education", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Hart
's
surgery
was
completed
at
the
University
of
Oregon
Medical
School
over
the
1917–1918
winter
vacation
.
Hart:person-other
's:O
surgery:O
was:O
completed:O
at:O
the:O
University:organization-education
of:organization-education
Oregon:organization-education
Medical:organization-education
School:organization-education
over:O
the:O
1917–1918:O
winter:O
vacation:O
.:O