With no explanation, label each line with "location-GPE", "O", "building-airport", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-hospital" preceded by ":".
The
initial
service
flew
from
Mercedita
Airport
in
Ponce
to
Luis
Muñoz
Marín
International
Airport
(
then
known
as
``
Isla
Verde
International
Airport
``
)
in
San
Juan
.
The:O
initial:O
service:O
flew:O
from:O
Mercedita:building-airport
Airport:building-airport
in:O
Ponce:location-GPE
to:O
Luis:building-airport
Muñoz:building-airport
Marín:building-airport
International:building-airport
Airport:building-airport
(:O
then:O
known:O
as:O
``:O
Isla:building-airport
Verde:building-airport
International:building-airport
Airport:building-airport
``:O
):O
in:O
San:location-GPE
Juan:location-GPE
.:O