With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
If
a
wrestler
is
seriously
injured
,
the
referee
normally
signals
the
need
for
immediate
help
by
doing
an
``
X
''
formation
with
his
arms
over
his
head
.
If:O
a:O
wrestler:O
is:O
seriously:O
injured:O
,:O
the:O
referee:O
normally:O
signals:O
the:O
need:O
for:O
immediate:O
help:O
by:O
doing:O
an:O
``:O
X:O
'':O
formation:O
with:O
his:O
arms:O
over:O
his:O
head:O
.:O