With no explanation, label each line with "O", "product-software", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
is
implemented
as
a
Firefox
Add-On
and
as
a
Chrome
Extension
.
It:O
is:O
implemented:O
as:O
a:O
Firefox:product-software
Add-On:product-software
and:O
as:O
a:O
Chrome:product-software
Extension:product-software
.:O