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 ":".
He
returned
to
Cambridge
the
following
year
as
professor
of
haematology
,
retiring
in
2003
,
but
as
professor
emeritus
he
has
continued
his
research
at
Cambridge
.
He:O
returned:O
to:O
Cambridge:organization-education
the:O
following:O
year:O
as:O
professor:O
of:O
haematology:O
,:O
retiring:O
in:O
2003:O
,:O
but:O
as:O
professor:O
emeritus:O
he:O
has:O
continued:O
his:O
research:O
at:O
Cambridge:organization-education
.:O