With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
In
the
second
half
of
the
twentieth
century
,
improvements
in
oceanography
,
in
particular
understanding
of
seafloor
spreading
and
plate
tectonics
,
have
left
little
scientific
basis
for
geologically
recent
lost
continents
such
as
Mu
.
In:O
the:O
second:O
half:O
of:O
the:O
twentieth:O
century:O
,:O
improvements:O
in:O
oceanography:O
,:O
in:O
particular:O
understanding:O
of:O
seafloor:O
spreading:O
and:O
plate:O
tectonics:O
,:O
have:O
left:O
little:O
scientific:O
basis:O
for:O
geologically:O
recent:O
lost:O
continents:O
such:O
as:O
Mu:location-GPE
.:O