With no explanation, label each line with "product-car", "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Prior
to
1960
,
John
Deere
only
produced
tractors
that
had
two-cylinder
engines
.
Prior:O
to:O
1960:O
,:O
John:person-other
Deere:person-other
only:O
produced:O
tractors:product-car
that:O
had:O
two-cylinder:O
engines:O
.:O