With no explanation, label each line with "building-other", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
is
now
an
National
Monument
and
part
of
a
320-acre
(
1.3
km²
)
national
historic
park
.
It:O
is:O
now:O
an:O
National:building-other
Monument:building-other
and:O
part:O
of:O
a:O
320-acre:O
(:O
1.3:O
km²:O
):O
national:O
historic:O
park:O
.:O