With no explanation, label each line with "O", "location-island", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Before
that
,
the
residents
survived
by
fishing
,
limited
trading
,
and
salvage
of
ships
wrecked
on
Elbow
Reef
.
Before:O
that:O
,:O
the:O
residents:O
survived:O
by:O
fishing:O
,:O
limited:O
trading:O
,:O
and:O
salvage:O
of:O
ships:O
wrecked:O
on:O
Elbow:location-island
Reef:location-island
.:O