With no explanation, label each line with "location-GPE", "building-other", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
CN
Tower
,
once
the
tallest
free-standing
structure
in
the
world
,
remains
the
tallest
such
structure
in
the
Americas
,
standing
at
553.33
metres
(
1,815
ft.
,
5
inches
)
.
The:O
CN:building-other
Tower:building-other
,:O
once:O
the:O
tallest:O
free-standing:O
structure:O
in:O
the:O
world:O
,:O
remains:O
the:O
tallest:O
such:O
structure:O
in:O
the:O
Americas:location-GPE
,:O
standing:O
at:O
553.33:O
metres:O
(:O
1,815:O
ft.:O
,:O
5:O
inches:O
):O
.:O