With no explanation, label each line with "location-GPE", "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Bohemond
and
his
vassals
marched
to
Acre
.
Bohemond:person-other
and:O
his:O
vassals:O
marched:O
to:O
Acre:location-GPE
.:O