<s>
Multipurpose	B-Protocol
Internet	I-Protocol
Mail	I-Protocol
Extensions	I-Protocol
(	O
MIME	B-Protocol
)	O
is	O
an	O
Internet	O
standard	O
that	O
extends	O
the	O
format	O
of	O
email	O
messages	O
to	O
support	O
text	O
in	O
character	B-General_Concept
sets	I-General_Concept
other	O
than	O
ASCII	B-Protocol
,	O
as	O
well	O
as	O
attachments	O
of	O
audio	O
,	O
video	O
,	O
images	O
,	O
and	O
application	O
programs	O
.	O
</s>
<s>
Email	O
messages	O
with	O
MIME	B-Protocol
formatting	O
are	O
typically	O
transmitted	O
with	O
standard	O
protocols	O
,	O
such	O
as	O
the	O
Simple	B-Protocol
Mail	I-Protocol
Transfer	I-Protocol
Protocol	I-Protocol
(	O
SMTP	B-Protocol
)	O
,	O
the	O
Post	B-Protocol
Office	I-Protocol
Protocol	I-Protocol
(	O
POP	O
)	O
,	O
and	O
the	O
Internet	B-Protocol
Message	I-Protocol
Access	I-Protocol
Protocol	I-Protocol
(	O
IMAP	B-Protocol
)	O
.	O
</s>
<s>
The	O
MIME	B-Protocol
standard	O
is	O
specified	O
in	O
a	O
series	O
of	O
requests	O
for	O
comments	O
:	O
,	O
</s>
<s>
Although	O
the	O
MIME	B-Protocol
formalism	O
was	O
designed	O
mainly	O
for	O
SMTP	B-Protocol
,	O
its	O
content	B-Application
types	I-Application
are	O
also	O
important	O
in	O
other	O
communication	O
protocols	O
.	O
</s>
<s>
In	O
the	O
HyperText	B-Protocol
Transfer	I-Protocol
Protocol	I-Protocol
(	O
HTTP	B-Protocol
)	O
for	O
the	O
World	O
Wide	O
Web	O
,	O
servers	O
insert	O
a	O
MIME	B-Protocol
header	O
field	O
at	O
the	O
beginning	O
of	O
any	O
Web	O
transmission	O
.	O
</s>
<s>
Clients	O
use	O
the	O
content	B-Application
type	I-Application
or	O
media	B-Application
type	I-Application
header	O
to	O
select	O
an	O
appropriate	O
viewer	O
application	O
for	O
the	O
type	O
of	O
data	O
indicated	O
.	O
</s>
<s>
MIME	B-Protocol
originated	O
from	O
the	O
Andrew	B-Operating_System
Messaging	I-Operating_System
System	I-Operating_System
,	O
which	O
was	O
part	O
of	O
Andrew	B-Operating_System
Project	I-Operating_System
developed	O
at	O
Carnegie	O
Mellon	O
University	O
(	O
CMU	O
)	O
,	O
as	O
a	O
cross-platform	O
alternative	O
to	O
the	O
Andrew-specific	O
data	O
format	O
.	O
</s>
<s>
The	O
presence	O
of	O
this	O
header	O
field	O
indicates	O
the	O
message	O
is	O
MIME-formatted	O
.	O
</s>
<s>
According	O
to	O
MIME	B-Protocol
co-creator	O
Nathaniel	O
Borenstein	O
,	O
the	O
version	O
number	O
was	O
introduced	O
to	O
permit	O
changes	O
to	O
the	O
MIME	B-Protocol
protocol	O
in	O
subsequent	O
versions	O
.	O
</s>
<s>
However	O
,	O
Borenstein	O
admitted	O
short-comings	O
in	O
the	O
specification	O
that	O
hindered	O
the	O
implementation	O
of	O
this	O
feature	O
:	O
"	O
We	O
did	O
not	O
adequately	O
specify	O
how	O
to	O
handle	O
a	O
future	O
MIME	B-Protocol
version	O
.	O
</s>
<s>
Through	O
the	O
use	O
of	O
the	O
multipart	O
type	O
,	O
MIME	B-Protocol
allows	O
mail	O
messages	O
to	O
have	O
parts	O
arranged	O
in	O
a	O
tree	B-Data_Structure
structure	I-Data_Structure
where	O
the	O
leaf	O
nodes	O
are	O
any	O
non-multipart	O
content	B-Application
type	I-Application
and	O
the	O
non-leaf	O
nodes	O
are	O
any	O
of	O
a	O
variety	O
of	O
multipart	O
types	O
.	O
</s>
<s>
The	O
original	O
MIME	B-Protocol
specifications	O
only	O
described	O
the	O
structure	O
of	O
mail	O
messages	O
.	O
</s>
<s>
A	O
MIME	B-Protocol
part	O
can	O
have	O
:	O
</s>
<s>
In	O
addition	O
to	O
the	O
presentation	O
style	O
,	O
the	O
field	O
Content-Disposition	O
also	O
provides	O
parameters	O
for	O
specifying	O
the	O
name	O
of	O
the	O
file	O
,	O
the	O
creation	O
date	O
and	O
modification	O
date	O
,	O
which	O
can	O
be	O
used	O
by	O
the	O
reader	O
's	O
mail	B-Protocol
user	I-Protocol
agent	I-Protocol
to	O
store	O
the	O
attachment	O
.	O
</s>
<s>
As	O
of	O
2010	O
,	O
a	O
majority	O
of	O
mail	B-Protocol
user	I-Protocol
agents	I-Protocol
did	O
not	O
follow	O
this	O
prescription	O
fully	O
.	O
</s>
<s>
The	O
widely	O
used	O
Mozilla	B-Application
Thunderbird	I-Application
mail	B-Protocol
client	I-Protocol
ignores	O
the	O
content-disposition	O
fields	O
in	O
the	O
messages	O
and	O
uses	O
independent	O
algorithms	O
for	O
selecting	O
the	O
MIME	B-Protocol
parts	O
to	O
display	O
automatically	O
.	O
</s>
<s>
Thunderbird	B-Application
prior	O
to	O
version	O
3	O
also	O
sends	O
out	O
newly	O
composed	O
messages	O
with	O
inline	O
content	O
disposition	O
for	O
all	O
MIME	B-Protocol
parts	O
.	O
</s>
<s>
Many	O
mail	B-Protocol
user	I-Protocol
agents	I-Protocol
also	O
send	O
messages	O
with	O
the	O
file	O
name	O
in	O
the	O
name	O
parameter	O
of	O
the	O
content-type	B-Application
header	O
instead	O
of	O
the	O
filename	O
parameter	O
of	O
the	O
header	O
field	O
Content-Disposition	O
.	O
</s>
<s>
In	O
HTTP	B-Protocol
,	O
the	O
response	O
header	O
field	O
Content-Disposition	O
:	O
attachment	O
is	O
usually	O
used	O
as	O
a	O
hint	O
to	O
the	O
client	O
to	O
present	O
the	O
response	O
body	O
as	O
a	O
downloadable	O
file	O
.	O
</s>
<s>
Typically	O
,	O
when	O
receiving	O
such	O
a	O
response	O
,	O
a	O
Web	B-Application
browser	I-Application
prompts	O
the	O
user	O
to	O
save	O
its	O
content	O
as	O
a	O
file	O
,	O
instead	O
of	O
displaying	O
it	O
as	O
a	O
page	O
in	O
a	O
browser	B-Application
window	O
,	O
with	O
filename	O
suggesting	O
the	O
default	O
file	O
name	O
.	O
</s>
<s>
In	O
June	O
1992	O
,	O
MIME	B-Protocol
(	O
RFC	O
1341	O
,	O
since	O
made	O
obsolete	O
by	O
RFC	O
2045	O
)	O
defined	O
a	O
set	O
of	O
methods	O
for	O
representing	O
binary	O
data	O
in	O
formats	O
other	O
than	O
ASCII	B-Protocol
text	I-Protocol
format	O
.	O
</s>
<s>
The	O
content-transfer-encoding	O
:	O
MIME	B-Protocol
header	O
field	O
has	O
2-sided	O
significance	O
:	O
</s>
<s>
It	O
indicates	O
whether	O
or	O
not	O
a	O
binary-to-text	O
encoding	O
scheme	O
has	O
been	O
used	O
on	O
top	O
of	O
the	O
original	O
encoding	O
as	O
specified	O
within	O
the	O
Content-Type	B-Application
header	O
:	O
</s>
<s>
In	O
these	O
cases	O
,	O
the	O
header	O
field	O
is	O
actually	O
redundant	O
for	O
the	O
email	B-Protocol
client	I-Protocol
to	O
decode	O
the	O
message	O
body	O
,	O
but	O
it	O
may	O
still	O
be	O
useful	O
as	O
an	O
indicator	O
of	O
what	O
type	O
of	O
object	O
is	O
being	O
sent	O
.	O
</s>
<s>
Values	O
'	O
quoted-printable	O
'	O
and	O
'	O
base64	B-Protocol
 '	O
tell	O
the	O
email	B-Protocol
client	I-Protocol
that	O
a	O
binary-to-text	O
encoding	O
scheme	O
was	O
used	O
and	O
that	O
appropriate	O
initial	O
decoding	O
is	O
necessary	O
before	O
the	O
message	O
can	O
be	O
read	O
with	O
its	O
original	O
encoding	O
(	O
e.g.	O
</s>
<s>
Suitable	O
for	O
use	O
with	O
normal	O
SMTP	B-Protocol
:	O
</s>
<s>
Designed	O
to	O
be	O
efficient	O
and	O
mostly	O
human	O
readable	O
when	O
used	O
for	O
text	O
data	O
consisting	O
primarily	O
of	O
US-ASCII	B-Protocol
characters	O
but	O
also	O
containing	O
a	O
small	O
proportion	O
of	O
bytes	O
with	O
values	O
outside	O
that	O
range	O
.	O
</s>
<s>
base64	B-Protocol
–	O
used	O
to	O
encode	O
arbitrary	O
octet	O
sequences	O
into	O
a	O
form	O
that	O
satisfies	O
the	O
rules	O
of	O
7bit	O
.	O
</s>
<s>
Sometimes	O
used	O
for	O
text	O
data	O
that	O
frequently	O
uses	O
non-US-ASCII	O
characters	O
.	O
</s>
<s>
Suitable	O
for	O
use	O
with	O
SMTP	B-Protocol
servers	I-Protocol
that	O
support	O
the	O
8BITMIME	O
SMTP	B-Protocol
extension	O
(	O
RFC	O
6152	O
)	O
:	O
</s>
<s>
Suitable	O
for	O
use	O
with	O
SMTP	B-Protocol
servers	I-Protocol
that	O
support	O
the	O
BINARYMIME	O
SMTP	B-Protocol
extension	O
(	O
RFC	O
3030	O
)	O
:	O
</s>
<s>
There	O
is	O
no	O
encoding	O
defined	O
which	O
is	O
explicitly	O
designed	O
for	O
sending	O
arbitrary	O
binary	O
data	O
through	O
SMTP	B-Protocol
transports	O
with	O
the	O
8BITMIME	O
extension	O
.	O
</s>
<s>
Thus	O
,	O
if	O
BINARYMIME	O
is	O
n't	O
supported	O
,	O
base64	B-Protocol
or	O
quoted-printable	O
(	O
with	O
their	O
associated	O
inefficiency	O
)	O
are	O
sometimes	O
still	O
useful	O
.	O
</s>
<s>
This	O
restriction	O
does	O
not	O
apply	O
to	O
other	O
uses	O
of	O
MIME	B-Protocol
such	O
as	O
Web	O
Services	O
with	O
MIME	B-Protocol
attachments	I-Protocol
or	O
MTOM	O
.	O
</s>
<s>
Since	O
RFC	O
2822	O
,	O
conforming	O
message	O
header	O
field	O
names	O
and	O
values	O
use	O
ASCII	B-Protocol
characters	I-Protocol
;	O
values	O
that	O
contain	O
non-ASCII	O
data	O
should	O
use	O
the	O
MIME	B-Protocol
encoded-word	O
syntax	O
(	O
RFC	O
2047	O
)	O
instead	O
of	O
a	O
literal	O
string	O
.	O
</s>
<s>
This	O
syntax	O
uses	O
a	O
string	O
of	O
ASCII	B-Protocol
characters	I-Protocol
indicating	O
both	O
the	O
original	O
character	B-General_Concept
encoding	I-General_Concept
(	O
the	O
"	O
charset	B-General_Concept
"	O
)	O
and	O
the	O
content-transfer-encoding	O
used	O
to	O
map	O
the	O
bytes	O
of	O
the	O
charset	B-General_Concept
into	O
ASCII	B-Protocol
characters	I-Protocol
.	O
</s>
<s>
The	O
form	O
is	O
:	O
"	O
=	O
?	O
charset	B-General_Concept
?	O
encoding	O
?	O
encoded	O
text	O
?	O
=	O
"	O
.	O
</s>
<s>
charset	B-General_Concept
may	O
be	O
any	O
character	B-General_Concept
set	I-General_Concept
registered	O
with	O
IANA	O
.	O
</s>
<s>
Typically	O
it	O
would	O
be	O
the	O
same	O
charset	B-General_Concept
as	O
the	O
message	O
body	O
.	O
</s>
<s>
encoding	O
can	O
be	O
either	O
"	O
Q	O
"	O
denoting	O
Q-encoding	O
that	O
is	O
similar	O
to	O
the	O
quoted-printable	O
encoding	O
,	O
or	O
"	O
B	O
"	O
denoting	O
base64	B-Protocol
encoding	I-Protocol
.	O
</s>
<s>
encoded	O
text	O
is	O
the	O
Q-encoded	O
or	O
base64-encoded	O
text	O
.	O
</s>
<s>
An	O
encoded-word	O
may	O
not	O
be	O
more	O
than	O
75	O
characters	O
long	O
,	O
including	O
charset	B-General_Concept
,	O
encoding	O
,	O
encoded	O
text	O
,	O
and	O
delimiters	O
.	O
</s>
<s>
The	O
ASCII	B-Protocol
code	I-Protocol
for	O
space	O
may	O
not	O
be	O
represented	O
directly	O
because	O
it	O
could	O
cause	O
older	O
parsers	O
to	O
split	O
up	O
the	O
encoded	O
word	O
undesirably	O
.	O
</s>
<s>
To	O
make	O
the	O
encoding	O
smaller	O
and	O
easier	O
to	O
read	O
the	O
underscore	O
is	O
used	O
to	O
represent	O
the	O
ASCII	B-Protocol
code	I-Protocol
for	O
space	O
creating	O
the	O
side	O
effect	O
that	O
underscore	O
cannot	O
be	O
represented	O
directly	O
.	O
</s>
<s>
These	O
names	O
are	O
usually	O
English	O
terms	O
and	O
always	O
in	O
ASCII	B-Protocol
in	O
the	O
raw	O
message	O
.	O
</s>
<s>
When	O
viewing	O
a	O
message	O
with	O
a	O
non-English	O
email	B-Protocol
client	I-Protocol
,	O
the	O
header	O
field	O
names	O
might	O
be	O
translated	O
by	O
the	O
client	O
.	O
</s>
<s>
The	O
MIME	B-Protocol
multipart	B-Protocol
message	I-Protocol
contains	O
a	O
boundary	O
in	O
the	O
header	O
field	O
;	O
this	O
boundary	O
,	O
which	O
must	O
not	O
occur	O
in	O
any	O
of	O
the	O
parts	O
,	O
is	O
placed	O
between	O
the	O
parts	O
,	O
and	O
at	O
the	O
beginning	O
and	O
end	O
of	O
the	O
body	O
of	O
the	O
message	O
,	O
as	O
follows	O
:	O
</s>
<s>
The	O
multipart	O
block	O
as	O
a	O
whole	O
does	O
not	O
have	O
a	O
charset	B-General_Concept
;	O
non-ASCII	O
characters	O
in	O
the	O
part	O
headers	O
are	O
handled	O
by	O
the	O
Encoded-Word	O
system	O
,	O
and	O
the	O
part	O
bodies	O
can	O
have	O
charsets	B-General_Concept
specified	O
if	O
appropriate	O
for	O
their	O
content-type	B-Application
.	O
</s>
<s>
Before	O
the	O
first	O
boundary	O
is	O
an	O
area	O
that	O
is	O
ignored	O
by	O
MIME-compliant	O
clients	O
.	O
</s>
<s>
This	O
area	O
is	O
generally	O
used	O
to	O
put	O
a	O
message	O
to	O
users	O
of	O
old	O
non-MIME	O
clients	O
.	O
</s>
<s>
It	O
is	O
up	O
to	O
the	O
sending	O
mail	B-Protocol
client	I-Protocol
to	O
choose	O
a	O
boundary	O
string	O
that	O
does	O
n't	O
clash	O
with	O
the	O
body	O
text	O
.	O
</s>
<s>
The	O
MIME	B-Protocol
standard	O
defines	O
various	O
multipart-message	O
subtypes	O
,	O
which	O
specify	O
the	O
nature	O
of	O
the	O
message	O
parts	O
and	O
their	O
relationship	O
to	O
one	O
another	O
.	O
</s>
<s>
For	O
example	O
,	O
a	O
multipart	O
MIME	B-Protocol
message	O
using	O
the	O
digest	O
subtype	O
would	O
have	O
its	O
set	O
as	O
"	O
multipart/digest	O
"	O
.	O
</s>
<s>
If	O
sending	O
pictures	O
or	O
other	O
easily	O
readable	O
files	O
,	O
most	O
mail	B-Protocol
clients	I-Protocol
will	O
display	O
them	O
inline	O
(	O
unless	O
explicitly	O
specified	O
with	O
Content-Disposition	O
:	O
attachment	O
in	O
which	O
case	O
offered	O
as	O
attachments	O
)	O
.	O
</s>
<s>
The	O
default	O
content-type	B-Application
for	O
each	O
part	O
is	O
"	O
text/plain	O
"	O
.	O
</s>
<s>
The	O
default	O
content-type	B-Application
for	O
each	O
part	O
is	O
"	O
message/rfc822	O
"	O
.	O
</s>
<s>
The	O
MIME	B-Application
type	I-Application
is	O
defined	O
in	O
RFC	O
2046	O
.	O
</s>
<s>
The	O
multipart/alternative	O
subtype	O
indicates	O
that	O
each	O
part	O
is	O
an	O
"	O
alternative	O
"	O
version	O
of	O
the	O
same	O
(	O
or	O
similar	O
)	O
content	O
,	O
each	O
in	O
a	O
different	O
format	O
denoted	O
by	O
its	O
"	O
Content-Type	B-Application
"	O
header	O
.	O
</s>
<s>
This	O
makes	O
life	O
easier	O
for	O
users	O
of	O
clients	O
that	O
do	O
not	O
understand	O
multipart	B-Protocol
messages	I-Protocol
.	O
</s>
<s>
Most	O
commonly	O
,	O
multipart/alternative	O
is	O
used	O
for	O
email	O
with	O
two	O
parts	O
,	O
one	O
plain	O
text	O
(	O
text/plain	O
)	O
and	O
one	O
HTML	B-Language
(	O
text/html	B-Language
)	O
.	O
</s>
<s>
The	O
plain	O
text	O
part	O
provides	O
backwards	O
compatibility	O
while	O
the	O
HTML	B-Language
part	O
allows	O
use	O
of	O
formatting	O
and	O
hyperlinks	O
.	O
</s>
<s>
Most	O
email	B-Protocol
clients	I-Protocol
offer	O
a	O
user	O
option	O
to	O
prefer	O
plain	O
text	O
over	O
HTML	B-Language
;	O
this	O
is	O
an	O
example	O
of	O
how	O
local	O
factors	O
may	O
affect	O
how	O
an	O
application	O
chooses	O
which	O
"	O
best	O
"	O
part	O
of	O
the	O
message	O
to	O
display	O
.	O
</s>
<s>
At	O
one	O
time	O
,	O
anti-spam	O
filters	O
would	O
only	O
examine	O
the	O
text/plain	O
part	O
of	O
a	O
message	O
,	O
because	O
it	O
is	O
easier	O
to	O
parse	O
than	O
the	O
text/html	B-Language
part	O
.	O
</s>
<s>
But	O
spammers	O
eventually	O
took	O
advantage	O
of	O
this	O
,	O
creating	O
messages	O
with	O
an	O
innocuous-looking	O
text/plain	O
part	O
and	O
advertising	O
in	O
the	O
text/html	B-Language
part	O
.	O
</s>
<s>
The	O
root	O
part	O
would	O
contain	O
the	O
HTML	B-Language
document	O
,	O
and	O
use	O
image	O
tags	O
to	O
reference	O
images	O
stored	O
in	O
the	O
latter	O
parts	O
.	O
</s>
<s>
The	O
whole	O
of	O
the	O
body	O
part	O
,	O
including	O
mime	B-Protocol
fields	O
,	O
is	O
used	O
to	O
create	O
the	O
signature	O
part	O
.	O
</s>
<s>
Many	O
signature	O
types	O
are	O
possible	O
,	O
like	O
"	O
application/pgp	O
-signature	O
"	O
(	O
RFC	O
3156	O
)	O
and	O
"	O
application/pkcs7	O
-signature	O
"	O
(	O
S/MIME	B-Protocol
)	O
.	O
</s>
<s>
identified	O
by	O
their	O
separate	O
content	B-Application
types	I-Application
for	O
the	O
control	O
part	O
.	O
</s>
<s>
"	O
application/pgp	O
-encrypted	O
"	O
(	O
RFC	O
3156	O
)	O
and	O
"	O
application/pkcs7	O
-mime	O
"	O
(	O
S/MIME	B-Protocol
)	O
.	O
</s>
<s>
The	O
MIME	B-Application
type	I-Application
defined	O
in	O
RFC	O
1847	O
.	O
</s>
<s>
The	O
MIME	B-Application
type	I-Application
multipart/form	O
-data	O
is	O
used	O
to	O
express	O
values	O
submitted	O
through	O
a	O
form	O
.	O
</s>
<s>
Originally	O
defined	O
as	O
part	O
of	O
HTML	B-Language
4.0	I-Language
,	O
it	O
is	O
most	O
commonly	O
used	O
for	O
submitting	O
files	O
with	O
HTTP	B-Protocol
.	I-Protocol
</s>
<s>
The	O
content	B-Application
type	I-Application
multipart/x	O
-mixed-replace	O
was	O
developed	O
as	O
part	O
of	O
a	O
technology	O
to	O
emulate	O
server	B-General_Concept
push	I-General_Concept
and	O
streaming	O
over	O
HTTP	B-Protocol
.	I-Protocol
</s>
<s>
Originally	O
developed	O
by	O
Netscape	B-Protocol
,	O
it	O
is	O
still	O
supported	O
by	O
Mozilla	B-Operating_System
,	O
Firefox	B-Application
,	O
Safari	B-Application
,	O
and	O
Opera	B-Application
.	O
</s>
<s>
It	O
is	O
commonly	O
used	O
in	O
IP	B-Algorithm
cameras	I-Algorithm
as	O
the	O
MIME	B-Application
type	I-Application
for	O
MJPEG	B-Application
streams	O
.	O
</s>
<s>
It	O
was	O
supported	O
by	O
Chrome	O
for	O
main	O
resources	O
until	O
2013	O
(	O
images	O
can	O
still	O
be	O
displayed	O
using	O
this	O
content	B-Application
type	I-Application
)	O
.	O
</s>
<s>
The	O
multipart/byterange	O
is	O
used	O
to	O
represent	O
noncontiguous	O
byte	O
ranges	O
of	O
a	O
single	O
message	O
,	O
it	O
is	O
used	O
by	O
HTTP	B-Protocol
when	O
a	O
server	O
returns	O
multiple	O
byte	O
ranges	O
and	O
is	O
defined	O
in	O
RFC	B-Protocol
2616	I-Protocol
.	O
</s>
<s>
,	O
SMTP	B-Protocol
Service	O
Extension	O
for	O
8bit-MIMEtransport	O
.	O
</s>
<s>
,	O
MIME	B-Protocol
Part	O
Two	O
:	O
Media	B-Application
Types	I-Application
.	O
</s>
<s>
,	O
MIME	B-Protocol
Part	O
Three	O
:	O
Message	O
Header	O
Extensions	O
for	O
Non-ASCII	O
Text	O
.	O
</s>
<s>
,	O
MIME	B-Protocol
Part	O
Four	O
:	O
Media	B-Application
Type	I-Application
Specifications	O
and	O
Registration	O
Procedures	O
.	O
</s>
<s>
,	O
MIME	B-Protocol
Part	O
Four	O
:	O
Registration	O
Procedures	O
.	O
</s>
<s>
,	O
MIME	B-Protocol
Part	O
Five	O
:	O
Conformance	O
Criteria	O
and	O
Examples	O
.	O
</s>
<s>
,	O
MIME	B-Protocol
Parameter	O
Value	O
and	O
Encoded	O
Word	O
Extensions	O
:	O
Character	B-General_Concept
Sets	I-General_Concept
,	O
Languages	O
,	O
and	O
Continuations	O
.	O
</s>
