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 ":".
In
1973
two
McDonnell
Douglas
DC-10
widebody
jetliners
were
acquired
.
In:O
1973:O
two:O
McDonnell:product-airplane
Douglas:product-airplane
DC-10:product-airplane
widebody:O
jetliners:O
were:O
acquired:O
.:O