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
is
thought
to
be
a
naturally
occurring
hybrid
between
``
S.
arranensis
``
and
``
S.
aucuparia
``
,
probably
with
additional
backcrossing
with
``
S.
aucuparia
``
.
It:O
is:O
thought:O
to:O
be:O
a:O
naturally:O
occurring:O
hybrid:O
between:O
``:O
S.:other-livingthing
arranensis:other-livingthing
``:O
and:O
``:O
S.:other-livingthing
aucuparia:other-livingthing
``:O
,:O
probably:O
with:O
additional:O
backcrossing:O
with:O
``:O
S.:other-livingthing
aucuparia:other-livingthing
``:O
.:O