With no explanation, label each line with "other-livingthing", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
was
thought
that
the
sharks
form
a
polyphyletic
group
:
some
sharks
are
more
closely
related
to
rays
than
they
are
to
some
other
sharks
,
but
current
molecular
studies
support
monophyly
of
both
groups
of
sharks
and
batoids
.
It:O
was:O
thought:O
that:O
the:O
sharks:other-livingthing
form:O
a:O
polyphyletic:O
group:O
::O
some:O
sharks:other-livingthing
are:O
more:O
closely:O
related:O
to:O
rays:O
than:O
they:O
are:O
to:O
some:O
other:O
sharks:other-livingthing
,:O
but:O
current:O
molecular:O
studies:O
support:O
monophyly:O
of:O
both:O
groups:O
of:O
sharks:other-livingthing
and:O
batoids:other-livingthing
.:O