With no explanation, label each line with "O", "other-currency", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
At
chrome
,
it
produced
520
thousand
tons
,
at
a
value
of
R
$
254
million
.
At:O
chrome:O
,:O
it:O
produced:O
520:O
thousand:O
tons:O
,:O
at:O
a:O
value:O
of:O
R:other-currency
$:other-currency
254:O
million:O
.:O