With no explanation, label each line with "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
cabin
crew
for
this
leg
of
the
flight
later
told
investigators
that
Yousef
changed
seats
several
times
during
the
relatively
short
flight
,
with
his
last
seat
change
coming
after
a
return
from
the
lavatory
.
The:O
cabin:O
crew:O
for:O
this:O
leg:O
of:O
the:O
flight:O
later:O
told:O
investigators:O
that:O
Yousef:person-other
changed:O
seats:O
several:O
times:O
during:O
the:O
relatively:O
short:O
flight:O
,:O
with:O
his:O
last:O
seat:O
change:O
coming:O
after:O
a:O
return:O
from:O
the:O
lavatory:O
.:O