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 ":".
``
Eurotrochilus
``
are
believed
to
be
the
first
members
of
stem
group
Trochilidae
to
be
able
to
perform
nectarivory
.
``:O
Eurotrochilus:other-livingthing
``:O
are:O
believed:O
to:O
be:O
the:O
first:O
members:O
of:O
stem:O
group:O
Trochilidae:other-livingthing
to:O
be:O
able:O
to:O
perform:O
nectarivory:O
.:O