With no explanation, label each line with "O", "person-scholar", "product-weapon", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Dr
.
Gatling
later
used
examples
of
the
M1893
powered
by
electric
motor
and
belt
to
drive
the
crank
.
Dr:O
.:O
Gatling:person-scholar
later:O
used:O
examples:O
of:O
the:O
M1893:product-weapon
powered:O
by:O
electric:O
motor:O
and:O
belt:O
to:O
drive:O
the:O
crank:O
.:O