With no explanation, label each line with "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
fought
mainly
Bulgarian
forces
.
He:O
fought:O
mainly:O
Bulgarian:organization-other
forces:organization-other
.:O