With no explanation, label each line with "product-other", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
``
From
''
and
``
To
''
fields
along
with
the
IP
address
of
the
sender/receiver
have
been
considered
as
non-content
information
,
while
the
subject
has
been
considered
as
the
content
.
The:O
``:O
From:O
'':O
and:O
``:O
To:O
'':O
fields:O
along:O
with:O
the:O
IP:product-other
address:O
of:O
the:O
sender/receiver:O
have:O
been:O
considered:O
as:O
non-content:O
information:O
,:O
while:O
the:O
subject:O
has:O
been:O
considered:O
as:O
the:O
content:O
.:O