With no explanation, label each line with "product-other", "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
company
has
been
a
component
of
Belgium
's
benchmark
BEL20
stock
market
index
since
its
1991
inception
.
The:O
company:O
has:O
been:O
a:O
component:O
of:O
Belgium:location-GPE
's:O
benchmark:O
BEL20:product-other
stock:product-other
market:product-other
index:product-other
since:O
its:O
1991:O
inception:O
.:O