With no explanation, label each line with "O", "location-mountain", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
They
did
not
,
however
,
reach
the
summit
of
Mount
Everest
.
They:O
did:O
not:O
,:O
however:O
,:O
reach:O
the:O
summit:O
of:O
Mount:location-mountain
Everest:location-mountain
.:O