With no explanation, label each line with "product-other", "O", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
Nokia
N81
is
a
Symbian
OS
smartphone
announced
by
Nokia
on
29
August
2007
and
released
the
next
month
.
The:O
Nokia:product-other
N81:product-other
is:O
a:O
Symbian:product-other
OS:product-other
smartphone:product-other
announced:O
by:O
Nokia:organization-company
on:O
29:O
August:O
2007:O
and:O
released:O
the:O
next:O
month:O
.:O