With no explanation, label each line with "person-soldier", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
tower
eventually
fell
to
land-based
forces
under
Sir
John
Moore
after
two
days
of
heavy
fighting
.
The:O
tower:O
eventually:O
fell:O
to:O
land-based:O
forces:O
under:O
Sir:O
John:person-soldier
Moore:person-soldier
after:O
two:O
days:O
of:O
heavy:O
fighting:O
.:O