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 ":".
From
1941
to
1943
he
was
a
military
attaché
in
Sweden
.
From:O
1941:O
to:O
1943:O
he:O
was:O
a:O
military:O
attaché:O
in:O
Sweden:location-GPE
.:O