With no explanation, label each line with "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
In
1941
,
Gray
piloted
the
``
Cape
Town
Clipper
''
on
what
was
then
the
world
's
longest
proving
flight
.
In:O
1941:O
,:O
Gray:person-other
piloted:O
the:O
``:O
Cape:O
Town:O
Clipper:O
'':O
on:O
what:O
was:O
then:O
the:O
world:O
's:O
longest:O
proving:O
flight:O
.:O