With no explanation, label each line with "person-soldier", "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Harold
Stackard
initially
was
a
subaltern
in
the
Royal
Naval
Division
.
Harold:person-soldier
Stackard:person-soldier
initially:O
was:O
a:O
subaltern:O
in:O
the:O
Royal:organization-other
Naval:organization-other
Division:organization-other
.:O