<s>
AmigaOS	B-Application
4	I-Application
(	O
abbreviated	O
as	O
OS4	B-Application
or	O
AOS4	B-Application
)	O
is	O
a	O
line	O
of	O
Amiga	B-Application
operating	I-Application
systems	I-Application
which	O
runs	O
on	O
PowerPC	B-Architecture
microprocessors	O
.	O
</s>
<s>
It	O
is	O
mainly	O
based	O
on	O
AmigaOS	B-Application
3.1	O
source	O
code	O
developed	O
by	O
Commodore	O
,	O
and	O
partially	O
on	O
version	O
3.9	O
developed	O
by	O
Haage	O
&	O
Partner	O
.	O
</s>
<s>
"	O
The	O
Final	O
Update	O
"	O
(	O
for	O
OS	O
version	O
4.0	O
)	O
was	O
released	O
on	O
24	O
December	O
2006	O
(	O
originally	O
released	O
in	O
April	O
2004	O
)	O
after	O
five	O
years	O
of	O
development	O
by	O
the	O
Belgian	O
company	O
Hyperion	B-Operating_System
Entertainment	I-Operating_System
under	O
license	O
from	O
Amiga	B-Device
,	O
Inc	O
.	O
for	O
AmigaOne	B-Device
registered	O
users	O
.	O
</s>
<s>
During	O
the	O
five	O
years	O
of	O
development	O
,	O
purchasers	O
of	O
AmigaOne	B-Device
machines	O
could	O
download	O
pre-release	O
versions	O
of	O
AmigaOS	O
4.0	O
from	O
Hyperion	O
's	O
repository	O
as	O
long	O
as	O
these	O
were	O
made	O
available	O
.	O
</s>
<s>
On	O
20	O
December	O
2006	O
,	O
Amiga	B-Device
,	O
Inc	O
.	O
terminated	O
the	O
contract	O
with	O
Hyperion	B-Operating_System
Entertainment	I-Operating_System
to	O
produce	O
or	O
sell	O
AmigaOS	B-Application
4	I-Application
.	O
</s>
<s>
Nevertheless	O
,	O
AmigaOS	O
4.0	O
was	O
released	O
commercially	O
for	O
Amigas	B-Device
with	O
PowerUP	B-Operating_System
accelerator	O
cards	O
in	O
November	O
2007	O
(	O
having	O
been	O
available	O
only	O
to	O
developers	O
and	O
beta-testers	O
until	O
then	O
)	O
.	O
</s>
<s>
The	O
Italian	O
computer	O
company	O
ACube	O
Systems	O
has	O
announced	O
Sam440ep	B-Device
and	O
Sam440ep-flex	B-Device
motherboards	O
,	O
which	O
are	O
AmigaOS	B-Application
4	I-Application
compatible	O
.	O
</s>
<s>
Also	O
,	O
a	O
third	O
party	O
bootloader	O
,	O
known	O
as	O
the	O
"	O
Moana	O
"	O
,	O
was	O
released	O
by	O
Acube	O
on	O
torrent	O
sites	O
;	O
it	O
allows	O
installation	O
of	O
the	O
Sam440ep	B-Device
version	O
of	O
OS4	B-Application
to	O
Mac	B-Device
Mini	I-Device
G4s	O
.	O
</s>
<s>
During	O
the	O
judicial	O
procedure	O
(	O
between	O
Hyperion	O
and	O
Amiga	B-Device
,	O
Inc	O
.	O
)	O
,	O
OS4	B-Application
was	O
still	O
being	O
developed	O
and	O
distributed	O
.	O
</s>
<s>
On	O
30	O
September	O
2009	O
,	O
Hyperion	B-Operating_System
Entertainment	I-Operating_System
and	O
Amiga	B-Device
,	O
Inc	O
.	O
reached	O
a	O
settlement	O
agreement	O
where	O
Hyperion	O
is	O
granted	O
an	O
exclusive	O
right	O
to	O
AmigaOS	B-Application
3.1	O
and	O
market	O
AmigaOS	B-Application
4	I-Application
and	O
subsequent	O
versions	O
of	O
AmigaOS	B-Application
(	O
including	O
AmigaOS	B-Application
5	O
without	O
limitation	O
)	O
.	O
</s>
<s>
Hyperion	O
has	O
assured	O
the	O
Amiga	B-Device
community	O
that	O
it	O
will	O
continue	O
the	O
development	O
and	O
the	O
distribution	O
of	O
AmigaOS	O
4.x	O
(	O
and	O
beyond	O
)	O
,	O
as	O
it	O
has	O
done	O
since	O
November	O
2001	O
.	O
</s>
<s>
AmigaOS	B-Application
4	I-Application
can	O
be	O
divided	O
into	O
two	O
parts	O
:	O
the	O
Workbench	B-Operating_System
and	O
the	O
Kickstart	B-Device
.	O
</s>
<s>
The	O
Workbench	B-Operating_System
is	O
the	O
GUI	B-Application
of	O
OS4	B-Application
,	O
a	O
graphical	B-Application
interface	I-Application
file	O
manager	O
and	O
application	O
launcher	O
for	O
the	O
Operating	B-General_Concept
System	I-General_Concept
.	O
</s>
<s>
It	O
also	O
includes	O
some	O
general	O
purpose	O
tools	O
and	O
utility	O
programs	O
such	O
as	O
a	O
Notepad	O
for	O
typing	O
text	O
,	O
MultiView	O
for	O
viewing	O
images	O
and	O
Amigaguide	B-Operating_System
documents	O
,	O
Unarc	O
for	O
unpacking	O
Archives	O
,	O
a	O
PDF	O
reader	O
,	O
a	O
number	O
of	O
small	O
preferences	O
programs	O
for	O
changing	O
settings	O
of	O
the	O
GUI	B-Application
and	O
OS	O
,	O
among	O
other	O
programs	O
.	O
</s>
<s>
The	O
Kickstart	B-Device
contains	O
many	O
of	O
the	O
core	O
components	O
of	O
the	O
OS	O
.	O
</s>
<s>
Prior	O
to	O
version	O
4	O
of	O
AmigaOS	B-Application
the	O
Kickstart	B-Device
had	O
been	O
released	O
mostly	O
on	O
a	O
ROM	B-Device
(	O
hardware	O
included	O
with	O
the	O
computer	O
)	O
.	O
</s>
<s>
In	O
OS4	B-Application
the	O
Kickstart	B-Device
is	O
instead	O
stored	O
on	O
the	O
hard	O
disk	O
.	O
</s>
<s>
ExecSG	B-Operating_System
,	O
a	O
preemptive	O
multitasking	O
kernel	O
.	O
</s>
<s>
ExecSG	B-Operating_System
was	O
licensed	O
to	O
Hyperion	B-Operating_System
Entertainment	I-Operating_System
by	O
Thomas	O
and	O
Hans-Jörg	O
Frieden	O
.	O
</s>
<s>
Intuition	B-Application
,	O
a	O
windowing	O
system	O
API	O
.	O
</s>
<s>
AmigaDOS	B-Operating_System
and	O
AmigaShell	B-Operating_System
:	O
AmigaDOS	B-Operating_System
is	O
the	O
disk	O
operating	B-General_Concept
system	I-General_Concept
for	O
the	O
OS	O
,	O
whereas	O
AmigaShell	B-Operating_System
is	O
the	O
integrated	O
Command	O
Line	O
Interface	O
(	O
CLI	O
)	O
.	O
</s>
<s>
The	O
CLI	O
and	O
the	O
GUI	B-Application
complement	O
each	O
other	O
and	O
share	O
the	O
same	O
privileges	O
.	O
</s>
<s>
Petunia	O
,	O
a	O
Motorola	O
68020	O
processor	O
emulator	O
with	O
dynamic	O
recompilation	O
,	O
also	O
called	O
just-in-time	O
compilation	O
(	O
JIT	O
compilation	O
)	O
,	O
for	O
PowerPC	B-Architecture
based	O
Amigas	B-Device
.	O
</s>
<s>
It	O
gives	O
OS4	B-Application
backward	O
compatibility	O
to	O
some	O
extent	O
,	O
it	O
will	O
only	O
run	O
system	O
friendly	O
(	O
following	O
the	O
OS3.x	O
API	O
without	O
communicating	O
directly	O
with	O
the	O
classic	O
Amigas	B-Device
 '	O
custom	O
chipset	O
)	O
AmigaOS	B-Application
3.x	O
programs	O
.	O
</s>
<s>
For	O
the	O
programs	O
that	O
Petunia	O
is	O
unable	O
to	O
handle	O
,	O
such	O
as	O
most	O
"	O
bang	O
the	O
hardware	O
"	O
(	O
using	O
legacy	O
Amiga	B-Device
hardware	O
directly	O
)	O
Amiga	B-Application
games	I-Application
and	O
Amiga	B-Device
demos	I-Device
,	O
UAE	B-Device
can	O
be	O
used	O
which	O
can	O
emulate	O
different	O
Amiga	B-Device
chipsets	O
(	O
OCS	O
,	O
ECS	O
,	O
AGA	O
)	O
as	O
well	O
.	O
</s>
<s>
There	O
have	O
been	O
many	O
different	O
versions	O
of	O
the	O
AmigaOS	B-Application
operating	B-General_Concept
system	I-General_Concept
(	O
OS	O
)	O
during	O
its	O
three	O
decades	O
of	O
history	O
.	O
</s>
<s>
The	O
first	O
AmigaOS	B-Application
was	O
introduced	O
in	O
1985	O
and	O
developed	O
by	O
Commodore	O
International	O
.	O
</s>
<s>
It	O
was	O
nicknamed	O
Workbench	B-Operating_System
from	O
the	O
name	O
of	O
its	O
Graphical	B-Application
user	I-Application
interface	I-Application
(	O
GUI	B-Application
)	O
,	O
due	O
to	O
an	O
error	O
of	O
Commodore	O
Marketing	O
and	O
Sales	O
Department	O
,	O
which	O
labeled	O
the	O
OS	O
disk	O
just	O
with	O
the	O
name	O
"	O
Workbench	B-Operating_System
Disk	O
"	O
and	O
not	O
with	O
the	O
correct	O
name	O
"	O
AmigaOS	B-Application
Disk	O
(	O
Workbench	B-Operating_System
)	O
"	O
.	O
</s>
<s>
The	O
first	O
versions	O
of	O
AmigaOS	B-Application
(	O
1.0	O
and	O
up	O
to	O
1.3	O
)	O
are	O
here	O
indicated	O
with	O
the	O
name	O
of	O
their	O
original	O
disks	O
to	O
preserve	O
original	O
custom	O
.	O
</s>
<s>
Workbench	B-Operating_System
2.0	O
improvements	O
introduced	O
a	O
lot	O
of	O
major	O
advances	O
to	O
the	O
GUI	B-Application
of	O
Amiga	B-Application
operating	I-Application
system	I-Application
.	O
</s>
<s>
The	O
Workbench	B-Operating_System
was	O
no	O
longer	O
tied	O
to	O
the	O
640×256	O
(	O
PAL	O
)	O
or	O
640×200	O
(	O
NTSC	O
)	O
display	O
modes	O
,	O
and	O
much	O
of	O
the	O
system	O
was	O
improved	O
with	O
an	O
eye	O
to	O
making	O
future	O
expansion	O
easier	O
.	O
</s>
<s>
This	O
was	O
done	O
by	O
creating	O
the	O
Amiga	B-Device
Style	O
Guide	O
,	O
and	O
including	O
libraries	O
and	O
software	O
which	O
assisted	O
developers	O
in	O
making	O
conformant	O
software	O
.	O
</s>
<s>
Technologies	O
included	O
the	O
GUI	B-Application
element	O
creation	O
library	O
gadtools	O
,	O
the	O
software	O
installation	O
scripting	O
language	O
Installer	O
,	O
and	O
the	O
AmigaGuide	B-Operating_System
hypertext	O
help	O
system	O
.	O
</s>
<s>
After	O
the	O
demise	O
of	O
Commodore	O
International	O
,	O
the	O
later	O
owners	O
of	O
the	O
Amiga	B-Device
trademark	O
granted	O
a	O
license	O
to	O
a	O
German	O
company	O
called	O
Haage	O
&	O
Partner	O
to	O
update	O
the	O
Amiga	B-Device
's	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
Along	O
with	O
this	O
update	O
came	O
a	O
change	O
in	O
the	O
way	O
people	O
referred	O
to	O
the	O
Amiga	B-Device
's	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
Rather	O
than	O
specifying	O
"	O
Kickstart	B-Device
"	O
or	O
"	O
Workbench	B-Operating_System
"	O
,	O
the	O
updates	O
were	O
most	O
often	O
referred	O
to	O
as	O
simply	O
"	O
AmigaOS	B-Application
"	O
.	O
</s>
<s>
Whereas	O
all	O
previous	O
OS	O
releases	O
ran	O
on	O
vanilla	B-General_Concept
Amiga	B-Device
500	O
with	O
68000	O
and	O
512kB	O
RAM	O
,	O
release	O
3.5	O
onwards	O
required	O
a	O
68020	O
or	O
better	O
and	O
at	O
least	O
4MB	O
fast	O
RAM	O
.	O
</s>
<s>
In	O
2001	O
Amiga	B-Device
Inc	O
.	O
signed	O
a	O
contract	O
with	O
Hyperion	B-Operating_System
Entertainment	I-Operating_System
to	O
develop	O
the	O
PowerPC	B-Architecture
native	O
AmigaOS	B-Application
4	I-Application
from	O
their	O
previous	O
AmigaOS	B-Application
3.1	O
release	O
.	O
</s>
<s>
Unlike	O
the	O
previous	O
versions	O
which	O
were	O
based	O
on	O
the	O
Motorola	B-Device
68k	I-Device
central	O
processor	O
,	O
OS4	B-Application
runs	O
only	O
on	O
PowerPC	B-Architecture
computer	O
systems	O
.	O
</s>
<s>
Amiga	B-Device
,	O
Inc.	O
'	O
s	O
(	O
current	O
Amiga	B-Device
trademark	O
owners	O
)	O
distribution	O
policies	O
for	O
AmigaOS	O
4.0	O
and	O
any	O
later	O
versions	O
required	O
that	O
OS4	B-Application
must	O
be	O
bundled	O
with	O
all	O
new	O
third-party	O
hardware	O
"	O
Amigas	B-Device
"	O
,	O
with	O
the	O
sole	O
exception	O
of	O
Amigas	B-Device
with	O
Phase5	O
PowerPC	B-Architecture
accelerator	O
boards	O
,	O
for	O
which	O
OS4	B-Application
is	O
sold	O
separately	O
.	O
</s>
<s>
This	O
requirement	O
was	O
overturned	O
in	O
the	O
agreement	O
reached	O
between	O
Amiga	B-Device
,	O
Inc	O
.	O
and	O
Hyperion	O
in	O
the	O
settlement	O
of	O
a	O
lawsuit	O
over	O
the	O
ownership	O
of	O
AmigaOS	B-Application
4	I-Application
.	O
</s>
<s>
Prominent	O
features	O
compared	O
to	O
other	O
operating	B-General_Concept
systems	I-General_Concept
or	O
previous	O
versions	O
of	O
AmigaOS	B-Application
:	O
</s>
<s>
Descriptive	O
file	O
structure	O
:	O
Operating	B-General_Concept
system	I-General_Concept
files	O
are	O
divided	O
up	O
into	O
clearly	O
labelled	O
drawers	O
(	O
folders	O
)	O
.	O
</s>
<s>
RAM	B-Application
disk	I-Application
:	O
A	O
virtual	O
hard	O
drive	O
,	O
it	O
acts	O
like	O
any	O
other	O
disk	O
,	O
and	O
stores	O
files	O
and	O
data	O
in	O
memory	O
rather	O
than	O
on	O
the	O
hard	O
drive	O
.	O
</s>
<s>
The	O
RAM	B-Application
disk	I-Application
is	O
dynamically	O
resizable	O
and	O
takes	O
up	O
only	O
as	O
much	O
memory	O
as	O
it	O
needs	O
to	O
.	O
</s>
<s>
Additionally	O
there	O
is	O
an	O
optional	O
RAD	O
disk	O
,	O
a	O
recoverable	O
version	O
of	O
the	O
RAM	B-Application
disk	I-Application
,	O
which	O
preserves	O
contents	O
after	O
a	O
reboot	O
.	O
</s>
<s>
Live	O
CD	O
:	O
The	O
OS4	B-Application
installation	O
CD	O
can	O
be	O
used	O
as	O
a	O
Live	O
CD	O
.	O
</s>
<s>
Using	O
the	O
AREXX	B-Operating_System
scripting	O
language	O
and	O
Python	B-Language
it	O
is	O
possible	O
to	O
automate	O
,	O
integrate	O
and	O
remote	O
control	O
almost	O
every	O
application	O
and	O
function	O
of	O
the	O
computer	O
.	O
</s>
<s>
The	O
Grim	B-Device
Reaper	I-Device
:	O
The	O
"	O
Guru	B-Device
Meditation	I-Device
"	O
is	O
replaced	O
by	O
"	O
The	O
Grim	B-Device
Reaper	I-Device
"	O
,	O
a	O
crash	O
handling	O
system	O
that	O
attempts	O
to	O
catch	O
crashes	O
and	O
attempts	O
to	O
stop	O
them	O
from	O
getting	O
out	O
of	O
control	O
.	O
</s>
<s>
AmiUpdate	O
:	O
Is	O
an	O
updating	O
system	O
designed	O
purely	O
for	O
the	O
latest	O
incarnation	O
of	O
the	O
AmigaOS	B-Application
4	I-Application
.	O
</s>
<s>
It	O
is	O
able	O
to	O
update	O
OS	O
files	O
and	O
also	O
all	O
Amiga	B-Device
programs	O
which	O
are	O
registered	O
to	O
use	O
the	O
same	O
update	O
program	O
that	O
is	O
standard	O
for	O
Amiga	B-Device
.	O
</s>
<s>
Updating	O
AmigaOS	B-Application
requires	O
only	O
few	O
libraries	O
to	O
be	O
put	O
in	O
standard	O
OS	O
location	O
"	O
Libs	O
:	O
"	O
,	O
"	O
Fonts	O
:	O
"	O
etc	O
.	O
</s>
<s>
This	O
leaves	O
Amiga	B-Device
users	O
with	O
a	O
minimal	O
knowledge	O
of	O
the	O
system	O
almost	O
free	O
to	O
perform	O
by	O
hand	O
the	O
update	O
of	O
the	O
system	O
files	O
.	O
</s>
<s>
SDK	O
:	O
A	O
Software	B-Application
development	I-Application
kit	I-Application
is	O
available	O
that	O
includes	O
various	O
versions	O
of	O
the	O
GCC	O
compiler	O
,	O
sample	O
code	O
and	O
tools	O
to	O
allow	O
developers	O
to	O
make	O
programs	O
for	O
AmigaOS	O
4.1	O
or	O
later	O
.	O
</s>
<s>
Released	O
for	O
Amigas	B-Device
equipped	O
with	O
third	O
party	O
PPC	O
add-on	O
boards	O
:	O
</s>
<s>
Released	O
for	O
AmigaOne	B-Device
motherboards	O
:	O
</s>
<s>
AmigaOne	B-Device
500	O
(	O
A1-500	O
)	O
,	O
an	O
AmigaOne	B-Device
computer	O
based	O
upon	O
the	O
Sam460ex	B-Device
board	O
introduced	O
by	O
Acube	O
Systems	O
.	O
</s>
<s>
Released	O
for	O
Pegasos	B-Device
systems	O
:	O
</s>
<s>
Released	O
for	O
Sam440	B-Device
systems	O
:	O
</s>
<s>
+	O
AmigaOS	B-Application
4	I-Application
version	O
information	O
Version	O
Release	O
date	O
Introduced	O
features4.0	O
Developer	O
Pre-releaseAmigaOS	O
4.0	O
Developer	O
Pre-release	O
goes	O
gold.April	O
2004	O
First	O
public	O
release	O
4.0	O
Developer	O
Pre-release	O
UpdateFirst	O
AmigaOS	O
4.0	O
Pre-Release	O
update	O
available	O
.	O
</s>
<s>
10	O
October	O
2004	O
AltiVec	B-General_Concept
support	O
,	O
PowerPC-native	O
Picasso96	O
and	O
MUI	O
,	O
USB	O
support	O
for	O
input	O
devices	O
Developer	O
Pre-release	O
Update	O
2	O
27	O
December	O
2004	O
Mass	O
Storage	O
Support	O
for	O
USB	O
Developer	O
Pre-release	O
Update	O
3	O
14	O
June	O
2005	O
PowerPC	B-Architecture
native	O
Warp3D	B-Library
drivers	O
for	O
Voodoo	O
3	O
(	O
Avenger	O
)	O
,	O
Voodoo	O
4/5	O
(	O
Napalm	O
)	O
and	O
the	O
Radeon	O
7x00	O
series	O
of	O
graphics	O
cards	O
;	O
WarpOS	B-Device
support	O
Developer	O
Pre-release	O
Update	O
4	O
8	O
February	O
2006	O
Petunia	O
just-in-time	O
68k	B-Device
emulator	O
;	O
Warp3D	B-Library
with	O
support	O
for	O
Voodoo	O
3/4/5	O
and	O
ATI	O
Radeon	O
models	O
7000	O
,	O
7200	O
,	O
7500	O
,	O
9000	O
,	O
9200	O
and	O
9250	O
;	O
Intuition	B-Application
supports	O
screen	O
dragging	O
4.0	O
The	O
Final	O
Update	O
24	O
December	O
2006	O
Virtualized	O
memory	O
and	O
faster	O
memory	O
allocation	O
system	O
(	O
Slab	B-General_Concept
allocator	I-General_Concept
)	O
;	O
new	O
icon	O
theme	O
(	O
Mason	O
icons	O
)	O
4.0	O
July	O
2007	O
Update	O
18	O
July	O
2007	O
Support	O
for	O
Shared	O
objects	O
;	O
Python	B-Language
2.5.1	O
;	O
merge	O
of	O
Tools	O
and	O
Utilities	O
drawers	O
for	O
Classic	O
Amiga	B-Device
November	O
2007	O
July	O
2007	O
Update	O
baseline	O
February	O
2008	O
update	O
for	O
CyberStormPPC	O
and	O
BlizzardPPC	O
23	O
February	O
2008	O
Addressed	O
some	O
issues	O
and	O
compatibility	O
problems	O
4.1	O
AmigaOS	O
4.1	O
17	O
September	O
2008	O
Memory	B-Architecture
paging	I-Architecture
;	O
JXFS	O
filesystem	O
;	O
Hardware	O
compositing	O
engine	O
;	O
Cairo	B-Language
device-independent	O
2D	O
rendering	O
libraryHyperion	O
Entertainment	O
announces	O
AmigaOS	O
4.1	O
.	O
</s>
<s>
4.1	O
Quick	O
Fix	O
21	O
June	O
2009	O
Addressed	O
some	O
issues	O
(	O
Warp	O
3D	O
drivers	O
,	O
IDE	O
drivers	O
,	O
JXFS	O
)	O
Update	O
1	O
14	O
January	O
2010	O
Improved	O
compositing	O
effects	O
(	O
fading	O
and	O
drop	O
shadows	O
)	O
;	O
New	O
notification	O
system	O
Ringhio	O
;	O
DDC	O
support	O
;	O
AppDir	O
:	O
handler	O
and	O
URLopen	O
;	O
new	O
Startup	O
preferences	O
;	O
new	O
icon	O
set	O
;	O
MiniGL	O
V2.2	O
Update	O
2	O
30	O
April	O
2010	O
Updated	O
Python	B-Language
;	O
Cairo	B-Language
1.8.10	O
(	O
partial	O
hardware	O
acceleration	O
)	O
;	O
AmiDock	O
supports	O
icon	O
scaling	O
Update	O
3	O
29	O
August	O
2011	O
USB	O
2.0	O
(	O
EHCI	O
)	O
support	O
;	O
Updated	O
MUI	O
(	O
for	O
easier	O
porting	O
of	O
MUI	O
4	O
applications	O
)	O
Update	O
4	O
22	O
December	O
2011	O
Emulation	O
drawer	O
with	O
AmigaOS	B-Application
3.x	O
ROMs	O
and	O
Workbench	B-Operating_System
files	O
;	O
RunInUAE	O
contribution	O
Update	O
5	O
28	O
January	O
2012	O
,	O
16	O
August	O
2012	O
First	O
public	O
release	O
for	O
AmigaOne	B-Device
X1000	I-Device
,	O
later	O
for	O
other	O
platforms	O
.	O
</s>
<s>
For	O
the	O
AmigaOS	O
4.2	O
,	O
Hyperion	B-Operating_System
Entertainment	I-Operating_System
planned	O
the	O
following	O
updates	O
:	O
</s>
