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 ":".
On
April
1
,
2011
,
less
than
two
years
later
,
a
strikingly
similar
incident
occurred
on
Southwest
Airlines
Flight
812
,
involving
another
Southwest
Airlines
Boeing
737-3H4
.
On:O
April:O
1:O
,:O
2011:O
,:O
less:O
than:O
two:O
years:O
later:O
,:O
a:O
strikingly:O
similar:O
incident:O
occurred:O
on:O
Southwest:product-airplane
Airlines:product-airplane
Flight:product-airplane
812:product-airplane
,:O
involving:O
another:O
Southwest:product-airplane
Airlines:product-airplane
Boeing:product-airplane
737-3H4:product-airplane
.:O