With no explanation, label each line with "product-car", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
PDP-7
was
introduced
in
December
1964
,
and
about
120
were
eventually
produced
.
The:O
PDP-7:product-car
was:O
introduced:O
in:O
December:O
1964:O
,:O
and:O
about:O
120:O
were:O
eventually:O
produced:O
.:O