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 ":".
His
work
involved
liaison
with
French
intelligence
(
1926–40
)
and
Polish
intelligence
(
1940–45
)
.
His:O
work:O
involved:O
liaison:O
with:O
French:location-GPE
intelligence:O
(:O
1926–40:O
):O
and:O
Polish:location-GPE
intelligence:O
(:O
1940–45:O
):O
.:O