With no explanation, label each line with "O", "art-painting", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
His
painting
'
Rooftops
'
has
been
in
the
collection
of
the
City
of
London
Corporation
since
1989
.
His:O
painting:O
':O
Rooftops:art-painting
':O
has:O
been:O
in:O
the:O
collection:O
of:O
the:O
City:organization-company
of:organization-company
London:organization-company
Corporation:organization-company
since:O
1989:O
.:O