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 ":".
Statistically
,
1996
was
a
safe
year
for
Everest
climbers
.
Statistically:O
,:O
1996:O
was:O
a:O
safe:O
year:O
for:O
Everest:location-mountain
climbers:O
.:O