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 ":".
It
became
the
tallest
building
in
the
borough
of
Barnet
.
It:O
became:O
the:O
tallest:O
building:O
in:O
the:O
borough:O
of:O
Barnet:location-GPE
.:O