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 ":".
As
its
worst
,
Buenos
Aires
population
was
reduced
to
a
third
because
of
the
exodus
of
those
escaping
the
scourge
.
As:O
its:O
worst:O
,:O
Buenos:location-GPE
Aires:location-GPE
population:O
was:O
reduced:O
to:O
a:O
third:O
because:O
of:O
the:O
exodus:O
of:O
those:O
escaping:O
the:O
scourge:O
.:O