With no explanation, label each line with "product-airplane", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
then
switched
to
Nieuports
,
bringing
down
two
LVGs
on
29
May
and
a
Fokker
Eindecker
on
1
June
.
He:O
then:O
switched:O
to:O
Nieuports:product-airplane
,:O
bringing:O
down:O
two:O
LVGs:product-airplane
on:O
29:O
May:O
and:O
a:O
Fokker:product-airplane
Eindecker:product-airplane
on:O
1:O
June:O
.:O