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 ":".
G-ASWI
had
previously
been
the
Westland
Helicopters
Company
demonstrator
before
being
purchased
by
Bristow
Helicopters
Ltd
.
in
April
1970
.
G-ASWI:product-airplane
had:O
previously:O
been:O
the:O
Westland:organization-company
Helicopters:organization-company
Company:organization-company
demonstrator:O
before:O
being:O
purchased:O
by:O
Bristow:organization-company
Helicopters:organization-company
Ltd:organization-company
.:organization-company
in:O
April:O
1970:O
.:O