With no explanation, label each line with "O", "other-astronomything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
compound
has
been
found
to
have
been
initially
produced
in
star-forming
regions
,
and
speculated
to
be
carried
by
interstellar
comets
throughout
outer
space
,
including
to
the
early
Earth
.
The:O
compound:O
has:O
been:O
found:O
to:O
have:O
been:O
initially:O
produced:O
in:O
star-forming:O
regions:O
,:O
and:O
speculated:O
to:O
be:O
carried:O
by:O
interstellar:O
comets:O
throughout:O
outer:O
space:O
,:O
including:O
to:O
the:O
early:O
Earth:other-astronomything
.:O