With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Its
most
significant
problem
at
Kursk
was
mine
damage
and
mechanical
failure
.
Its:O
most:O
significant:O
problem:O
at:O
Kursk:location-GPE
was:O
mine:O
damage:O
and:O
mechanical:O
failure:O
.:O