With no explanation, label each line with "O", "building-airport", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-hospital" preceded by ":".
The
airfield
was
requisitioned
by
the
Royal
Navy
during
the
Second
World
War
and
named
``
HMS
Gadwall
``
.
The:O
airfield:O
was:O
requisitioned:O
by:O
the:O
Royal:O
Navy:O
during:O
the:O
Second:event-attack/battle/war/militaryconflict
World:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
and:O
named:O
``:O
HMS:building-airport
Gadwall:building-airport
``:O
.:O