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 ":".
Carlsbad
is
a
hub
for
potash
mining
,
petroleum
production
,
and
tourism
.
Carlsbad:location-GPE
is:O
a:O
hub:O
for:O
potash:O
mining:O
,:O
petroleum:O
production:O
,:O
and:O
tourism:O
.:O