With no explanation, label each line with "location-GPE", "product-airplane", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
On
26
January
1950
,
the
Douglas
C-54
Skymaster
serial
number
``
42-72469
``
disappeared
en
route
from
Alaska
to
Montana
,
with
44
people
aboard
.
On:O
26:O
January:O
1950:O
,:O
the:O
Douglas:product-airplane
C-54:product-airplane
Skymaster:product-airplane
serial:O
number:O
``:O
42-72469:product-airplane
``:O
disappeared:O
en:O
route:O
from:O
Alaska:location-GPE
to:O
Montana:location-GPE
,:O
with:O
44:O
people:O
aboard:O
.:O