With no explanation, label each line with "O", "organization-government/governmentagency", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
worked
for
the
British
Secret
Intelligence
Service
(
MI6
)
between
1921
and
1959
.
He:O
worked:O
for:O
the:O
British:organization-government/governmentagency
Secret:organization-government/governmentagency
Intelligence:organization-government/governmentagency
Service:organization-government/governmentagency
(:O
MI6:organization-government/governmentagency
):O
between:O
1921:O
and:O
1959:O
.:O