With no explanation, label each line with "location-GPE", "O", "building-airport", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
DAC
operates
a
public
charter
route
between
Grand
Junction
Regional
Airport
in
western
Colorado
and
Centennial
Airport
in
the
Denver
area
twice
daily
.
DAC:organization-company
operates:O
a:O
public:O
charter:O
route:O
between:O
Grand:building-airport
Junction:building-airport
Regional:building-airport
Airport:building-airport
in:O
western:O
Colorado:location-GPE
and:O
Centennial:building-airport
Airport:building-airport
in:O
the:O
Denver:location-GPE
area:O
twice:O
daily:O
.:O