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
pilots
trained
in
meteorology
and
navigation
at
Langley
Field
in
Virginia
,
where
they
also
practiced
in
the
prototype
.
The:O
pilots:O
trained:O
in:O
meteorology:O
and:O
navigation:O
at:O
Langley:building-airport
Field:building-airport
in:O
Virginia:location-GPE
,:O
where:O
they:O
also:O
practiced:O
in:O
the:O
prototype:O
.:O