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 ":".
By
early
June
the
aircraft
had
returned
to
Kadena
after
the
conclusion
of
the
operation
.
By:O
early:O
June:O
the:O
aircraft:O
had:O
returned:O
to:O
Kadena:location-GPE
after:O
the:O
conclusion:O
of:O
the:O
operation:O
.:O