With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
The
formation
has
yielded
only
a
handful
of
Mesozoic
specimens
so
far
and
most
of
it
is
as
yet
unexcavated
.
The:O
formation:O
has:O
yielded:O
only:O
a:O
handful:O
of:O
Mesozoic:O
specimens:O
so:O
far:O
and:O
most:O
of:O
it:O
is:O
as:O
yet:O
unexcavated:O
.:O