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
renamed
in
memory
of
the
seven
astronauts
who
died
when
the
Space
Shuttle
``
Challenger
``
disintegrated
shortly
after
liftoff
on
January
28
,
1986
.
It:O
was:O
renamed:O
in:O
memory:O
of:O
the:O
seven:O
astronauts:O
who:O
died:O
when:O
the:O
Space:O
Shuttle:O
``:O
Challenger:product-airplane
``:O
disintegrated:O
shortly:O
after:O
liftoff:O
on:O
January:O
28:O
,:O
1986:O
.:O