With no explanation, label each line with "O", "organization-education", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
In
the
academic
years
1960–61
and
1972–73
he
was
a
visiting
professor
at
the
University
of
Oxford
.
In:O
the:O
academic:O
years:O
1960–61:O
and:O
1972–73:O
he:O
was:O
a:O
visiting:O
professor:O
at:O
the:O
University:organization-education
of:organization-education
Oxford:organization-education
.:O