With no explanation, label each line with "product-airplane", "O", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
aircraft
leased
from
Van
Air
Europe
were
four
leased
Let
L-410s
.
The:O
aircraft:O
leased:O
from:O
Van:organization-company
Air:organization-company
Europe:organization-company
were:O
four:O
leased:O
Let:O
L-410s:product-airplane
.:O