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 ":".
They
enlisted
against
a
traditional
Indian
enemy
,
``
...
who
were
now
in
the
old
Crow
country
,
menacing
and
often
raiding
the
Crows
in
their
reservation
camps
.
''
They:O
enlisted:O
against:O
a:O
traditional:O
Indian:O
enemy:O
,:O
``:O
...:O
who:O
were:O
now:O
in:O
the:O
old:O
Crow:O
country:O
,:O
menacing:O
and:O
often:O
raiding:O
the:O
Crows:O
in:O
their:O
reservation:O
camps:O
.:O
'':O