With no explanation, label each line with "product-other", "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
Packard
X-2775
(
company
designation
1A-2775
)
was
an
American
experimental
liquid-cooled
aircraft
engine
.
The:O
Packard:product-other
X-2775:product-other
(:O
company:O
designation:O
1A-2775:O
):O
was:O
an:O
American:location-GPE
experimental:O
liquid-cooled:O
aircraft:O
engine:O
.:O