With no explanation, label each line with "product-other", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
Dodrill–GMR
heart
machine
,
considered
by
some
to
be
the
first
operational
mechanical
heart
was
successfully
used
while
performing
heart
surgery
.
The:O
Dodrill–GMR:product-other
heart:O
machine:O
,:O
considered:O
by:O
some:O
to:O
be:O
the:O
first:O
operational:O
mechanical:O
heart:O
was:O
successfully:O
used:O
while:O
performing:O
heart:O
surgery:O
.:O