With no explanation, label each line with "location-GPE", "O", "other-law", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
By
the
Treaty
of
London
in
1839
,
the
status
of
the
grand
duchy
became
fully
sovereign
and
in
personal
union
to
the
king
of
the
Netherlands
.
By:O
the:O
Treaty:other-law
of:other-law
London:other-law
in:O
1839:O
,:O
the:O
status:O
of:O
the:O
grand:O
duchy:O
became:O
fully:O
sovereign:O
and:O
in:O
personal:O
union:O
to:O
the:O
king:O
of:O
the:O
Netherlands:location-GPE
.:O