With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Before
the
Countess
obtained
a
divorce
from
him
in
London
in
1937
,
they
were
the
parents
of
one
child
:
Before:O
the:O
Countess:O
obtained:O
a:O
divorce:O
from:O
him:O
in:O
London:location-GPE
in:O
1937:O
,:O
they:O
were:O
the:O
parents:O
of:O
one:O
child:O
::O