With no explanation, label each line with "product-airplane", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
was
also
the
site
of
the
Indian
Airlines
Flight
814
incident
in
1999
.
It:O
was:O
also:O
the:O
site:O
of:O
the:O
Indian:product-airplane
Airlines:product-airplane
Flight:product-airplane
814:product-airplane
incident:O
in:O
1999:O
.:O