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 ":".
After
several
years
under
British
mandate
,
on
December
24
,
1951
Libya
declared
its
independence
as
the
United
Kingdom
of
Libya
(
a
constitutional
,
hereditary
monarchy
under
King
Idris
)
.
After:O
several:O
years:O
under:O
British:location-GPE
mandate:O
,:O
on:O
December:O
24:O
,:O
1951:O
Libya:location-GPE
declared:O
its:O
independence:O
as:O
the:O
United:location-GPE
Kingdom:location-GPE
of:location-GPE
Libya:location-GPE
(:O
a:O
constitutional:O
,:O
hereditary:O
monarchy:O
under:O
King:O
Idris:person-politician
):O
.:O