With no explanation, label each line with "location-GPE", "O", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
From
1947
to
1951
he
led
the
Naval
Society
and
also
served
as
aide-de-camp
to
Haakon
VII
of
Norway
.
From:O
1947:O
to:O
1951:O
he:O
led:O
the:O
Naval:O
Society:O
and:O
also:O
served:O
as:O
aide-de-camp:O
to:O
Haakon:person-politician
VII:person-politician
of:O
Norway:location-GPE
.:O