<s>
Icinga	B-Protocol
is	O
an	O
open-source	B-Application
computer	O
system	B-Application
and	O
network	O
monitoring	O
application	O
.	O
</s>
<s>
It	O
was	O
originally	O
created	O
as	O
a	O
fork	B-Application
of	O
the	O
Nagios	B-Application
system	B-Application
monitoring	I-Application
application	O
in	O
2009	O
.	O
</s>
<s>
Icinga	B-Protocol
is	O
working	O
to	O
improve	O
the	O
Nagios	B-Application
 '	O
development	O
process	O
,	O
as	O
well	O
as	O
adding	O
new	O
features	O
such	O
as	O
a	O
modern	O
Web	O
2.0	O
style	O
user	O
interface	O
,	O
additional	O
database	O
connectors	O
(	O
for	O
MySQL	B-Application
,	O
Oracle	B-General_Concept
,	O
and	O
PostgreSQL	B-Application
)	O
,	O
and	O
a	O
REST	O
API	B-General_Concept
that	O
lets	O
administrators	O
integrate	O
numerous	O
extensions	O
without	O
complicated	O
modification	O
of	O
the	O
Icinga	B-Protocol
core	O
.	O
</s>
<s>
The	O
Icinga	B-Protocol
developers	O
also	O
seek	O
to	O
reflect	O
community	O
needs	O
more	O
closely	O
and	O
to	O
integrate	O
patches	O
more	O
quickly	O
.	O
</s>
<s>
In	O
May	O
2009	O
a	O
group	O
of	O
developers	O
from	O
the	O
Nagios	B-Application
community	O
announced	O
the	O
fork	B-Application
Icinga	B-Protocol
,	O
citing	O
their	O
dissatisfaction	O
with	O
the	O
stagnant	O
development	O
of	O
the	O
Nagios	B-Application
software	I-Application
at	O
the	O
time	O
and	O
their	O
desire	O
to	O
open	O
its	O
development	O
to	O
a	O
broader	O
base	O
.	O
</s>
<s>
The	O
name	O
Icinga	B-Protocol
is	O
a	O
Zulu	O
word	O
meaning	O
"	O
it	O
looks	O
for	O
"	O
,	O
"	O
it	O
browses	O
"	O
or	O
"	O
it	O
examines	O
"	O
and	O
is	O
pronounced	O
with	O
a	O
click	O
consonant	O
.	O
</s>
<s>
In	O
their	O
first	O
year	O
,	O
Icinga	B-Protocol
developers	O
released	O
separate	O
versions	O
of	O
Core	O
,	O
API	B-General_Concept
and	O
Web	O
,	O
and	O
celebrated	O
their	O
10,000	O
th	O
download	O
.	O
</s>
<s>
In	O
its	O
second	O
year	O
,	O
the	O
Icinga	B-Protocol
project	O
released	O
unified	O
and	O
stable	O
Core	O
and	O
Web	O
;	O
added	O
dual-stack	O
IPv6	B-Protocol
and	O
IPv4	B-Protocol
support	O
,	O
optimized	O
database	O
connectivity	O
and	O
revamped	O
the	O
Icinga	B-Protocol
Web	O
user	O
interface	O
,	O
integrating	O
various	O
community	O
add-ons	B-Application
(	O
PNP4Nagios	O
,	O
LConf	O
,	O
Heatmap	O
and	O
Business	O
Process	O
Addon	O
)	O
.	O
</s>
<s>
In	O
their	O
second	O
year	O
,	O
Icinga	B-Protocol
celebrated	O
their	O
100,000	O
th	O
download	O
,	O
integrated	O
the	O
Icinga	B-Protocol
API	B-General_Concept
component	O
into	O
Icinga	B-Protocol
Web	O
;	O
improved	O
SLA	O
reporting	O
;	O
and	O
extended	O
the	O
Icinga	B-Protocol
virtual	B-Application
appliances	I-Application
to	O
the	O
Debian	O
,	O
OpenSUSE	B-Operating_System
and	O
CentOS	O
operating	O
systems	O
.	O
</s>
<s>
In	O
October	O
2012	O
the	O
Icinga	B-Protocol
project	O
released	O
a	O
technology	O
preview	O
of	O
a	O
core	O
framework	O
replacement	O
and	O
parallel	O
development	O
branch	O
,	O
Icinga	B-Protocol
2	O
.	O
</s>
<s>
The	O
developers	O
expressed	O
their	O
intentions	O
to	O
rewrite	O
the	O
core	O
to	O
correct	O
shortcomings	O
,	O
such	O
as	O
complicated	O
configuration	O
and	O
scalability	B-Architecture
limitations	O
in	O
large	O
deployments	O
.	O
</s>
<s>
The	O
project	O
signposted	O
plans	O
to	O
write	O
the	O
Icinga	B-Protocol
2	O
core	O
mainly	O
in	O
C++	B-Language
,	O
design	O
a	O
new	O
component	O
loader	O
architecture	O
,	O
and	O
remodel	O
the	O
process	O
of	O
executing	O
monitoring	O
checks	O
.	O
</s>
<s>
In	O
June	O
2014	O
the	O
Icinga	B-Protocol
project	O
released	O
the	O
first	O
stable	O
release	O
of	O
Icinga	B-Protocol
2	O
.	O
</s>
<s>
New	O
features	O
,	O
such	O
as	O
an	O
agent	O
or	O
API	B-General_Concept
feature	O
,	O
are	O
scheduled	O
for	O
later	O
releases	O
.	O
</s>
<s>
Date	O
Release	O
Notes	O
12	O
November	O
2021	O
Icinga	B-Protocol
2	O
v2.13.2	O
This	O
version	O
only	O
includes	O
changes	O
needed	O
for	O
the	O
release	O
of	O
Icinga	B-Protocol
DB	O
1.0.0	O
RC2	O
and	O
does	O
n't	O
include	O
any	O
other	O
bug	O
fixes	O
or	O
features	O
.	O
</s>
<s>
19	O
September	O
2019	O
Icinga	B-Protocol
2	O
v2.11	O
The	O
"	O
biggest	O
release	O
ever	O
done	O
"	O
,	O
including	O
network	O
stack	O
rewrite	O
,	O
clustering	O
,	O
running	O
in	O
Docker	O
containers	O
,	O
TLS	O
1.2	O
,	O
Windows	O
client	O
,	O
documentation	O
.	O
</s>
<s>
19	O
March	O
2019	O
Icinga	B-Protocol
2	O
v2.10.4	O
Bugfix	O
release	O
.	O
</s>
<s>
26	O
February	O
2019	O
Icinga	B-Protocol
2	O
v2.10.3	O
Bugfix	O
release	O
.	O
</s>
<s>
14	O
November	O
2018	O
Icinga	B-Protocol
2	O
v2.10.2	O
Bugfix	O
release	O
.	O
</s>
<s>
Fixed	O
a	O
bug	O
with	O
hanging	O
HTTP	B-Protocol
request	O
sessions	O
.	O
</s>
<s>
18	O
October	O
2018	O
Icinga	B-Protocol
2	O
v2.10.1	O
Bugfix	O
release	O
.	O
</s>
<s>
11	O
October	O
2018	O
Icinga	B-Protocol
2	O
v2.10.0	O
Feature	O
release	O
with	O
support	O
for	O
namespaces	O
,	O
improved	O
TLS	O
connection	O
handling	O
,	O
updated	O
syntax	O
highlighting	O
and	O
updates	O
to	O
the	O
technical	O
concepts	O
documentation	O
.	O
</s>
<s>
24	O
July	O
2018	O
Icinga	B-Protocol
2	O
v2.9.1	O
Bugfix	O
release	O
.	O
</s>
<s>
Fixed	O
a	O
bug	O
when	O
using	O
the	O
daemonize	O
option	O
or	O
an	O
init	O
system	B-Application
different	O
to	O
systemd	O
.	O
</s>
<s>
17	O
July	O
2018	O
Icinga	B-Protocol
2	O
v2.9.0	O
Feature	O
release	O
with	O
Elasticsearch	O
6	O
support	O
,	O
TLS	O
support	O
for	O
IDO	O
PostgreSQL	B-Application
and	O
improvements	O
for	O
the	O
setup	O
wizard	O
,	O
check	O
scheduling	O
,	O
downtime	O
notification	O
handling	O
and	O
memory	O
handling	O
.	O
</s>
<s>
25	O
April	O
2018	O
Icinga	B-Protocol
2	O
v2.8.4	O
Bugfix	O
release	O
.	O
</s>
<s>
24	O
April	O
2018	O
Icinga	B-Protocol
2	O
v2.8.3	O
Bugfix	O
release	O
.	O
</s>
<s>
22	O
March	O
2018	O
Icinga	B-Protocol
2	O
v2.8.2	O
Bugfix	O
release	O
.	O
</s>
<s>
17	O
January	O
2018	O
Icinga	B-Protocol
2	O
v2.8.1	O
Bugfix	O
release	O
.	O
</s>
<s>
Fixed	O
a	O
bug	O
within	O
the	O
API	B-General_Concept
when	O
an	O
object	O
was	O
created	O
at	O
runtime	O
.	O
</s>
<s>
17	O
November	O
2017	O
Icinga	B-Protocol
2	O
v2.8.0	O
Feature	O
Release	O
with	O
new	O
CA	O
proxy	O
feature	O
.	O
</s>
<s>
ElasticsearchWriter	O
feature	O
with	O
HTTP	B-Protocol
proxy	O
support	O
.	O
</s>
<s>
CORS	O
support	O
for	O
the	O
REST	O
API	B-General_Concept
.	O
</s>
<s>
9	O
November	O
2017	O
Icinga	B-Protocol
2	O
v2.7.2	O
Bugfix	O
release	O
.	O
</s>
<s>
Documentation	O
updates	O
21	O
September	O
2017	O
Icinga	B-Protocol
2	O
v2.7.1	O
Bugfix	O
release	O
.	O
</s>
<s>
2	O
August	O
2017	O
Icinga	B-Protocol
2	O
v2.7.0	O
Feature	O
Release	O
with	O
new	O
notifications	O
scripts	O
,	O
Work	O
queues	O
,	O
Check	O
plugin	B-Application
for	O
NSClient++	O
API	B-General_Concept
and	O
stability	O
improvements	O
and	O
fixes	O
13	O
December	O
2016	O
Icinga	B-Protocol
2	O
v2.6.0	O
Feature	O
Release	O
with	O
bundled	O
NSClient++	O
&	O
stability	O
improvements	O
and	O
fixes	O
23	O
August	O
2016	O
Icinga	B-Protocol
2	O
v2.5.0	O
Feature	O
Release	O
with	O
InfluxDB	O
,	O
IDO	O
Performance	O
,	O
Time	O
period	O
Excludes	O
and	O
fixes	O
16	O
November	O
2015	O
Icinga	B-Protocol
2	O
v2.4.0	O
Feature	O
Release	O
with	O
new	O
API	B-General_Concept
(	O
REST	O
API	B-General_Concept
)	O
9	O
March	O
2015	O
Icinga	B-Protocol
2	O
v2.3.0	O
Feature	O
release	O
with	O
configuration	O
enhancements	O
(	O
functions	O
,	O
loops	O
,	O
conditionals	O
,	O
object	O
accessors	O
,	O
time	O
dependent	O
thresholds	O
,	O
etc	O
.	O
</s>
<s>
)	O
,	O
OpenTSDB	O
support	O
and	O
troubleshoot	O
cli	O
command	O
19	O
November	O
2014	O
1.12	O
Classic	O
UI	O
enhancements	O
and	O
fixes	O
17	O
November	O
2014	O
Icinga	B-Protocol
2	O
v2.2.0	O
Feature	O
release	O
with	O
remote	O
clients	O
,	O
CSR	O
auto-signing	O
,	O
cli	O
,	O
arrays/dictionaries	O
in	O
custom	O
attributes	O
29	O
August	O
2014	O
Icinga	B-Protocol
2	O
v2.1.0	O
Feature	O
release	O
with	O
enhanced	O
configuration	O
analysis	O
,	O
logging	O
,	O
cluster	O
High	O
Availability	O
features	O
16	O
June	O
2014	O
Icinga	B-Protocol
2	O
v2.0.0	O
First	O
stable	O
release	O
16	O
May	O
2014	O
Icinga	B-Protocol
2	O
v0.0.11	O
Redesigned	O
cluster	O
feature	O
with	O
High	O
Availability	O
and	O
load-balanced	O
zones	O
,	O
command	O
arguments	O
and	O
conditionals	O
29	O
April	O
2014	O
Icinga	B-Protocol
2	O
v0.0.10	O
Advanced	O
apply	O
rules	O
for	O
notifications	O
,	O
dependencies	O
,	O
custom	O
attributes	O
,	O
etc	O
.	O
</s>
<s>
Due	O
to	O
its	O
nature	O
as	O
a	O
fork	B-Application
,	O
Icinga	B-Protocol
offers	O
Nagios’	O
features	O
with	O
some	O
additions	O
such	O
as	O
optional	O
reporting	O
module	O
with	O
improved	O
SLA	O
accuracy	O
,	O
additional	O
database	O
connectors	O
for	O
PostgreSQL	B-Application
and	O
Oracle	B-General_Concept
,	O
and	O
distributed	O
systems	O
for	O
redundant	O
monitoring	O
.	O
</s>
<s>
Icinga	B-Protocol
also	O
maintains	O
configuration	O
and	O
plug-in	B-Application
compatibility	O
with	O
Nagios	B-Application
,	O
facilitating	O
migration	O
between	O
the	O
two	O
monitoring	O
software	O
.	O
</s>
<s>
Monitoring	O
of	O
network	O
services	O
(	O
SMTP	B-Protocol
,	O
POP3	B-Protocol
,	O
HTTP	B-Protocol
,	O
NNTP	B-Protocol
,	O
ping	B-Protocol
,	O
etc	O
.	O
)	O
</s>
<s>
Two	O
optional	O
user	O
interfaces	O
(	O
Icinga	B-Protocol
Classic	O
UI	O
and	O
Icinga	B-Protocol
Web	O
)	O
for	O
visualization	O
of	O
host	O
and	O
service	O
status	O
,	O
network	O
maps	O
,	O
reports	O
,	O
logs	O
,	O
etc	O
.	O
</s>
<s>
Icinga	B-Protocol
Core	O
is	O
written	O
in	O
C	B-Language
and	O
has	O
a	O
modular	O
architecture	O
with	O
standalone	O
core	O
,	O
user	O
interface	O
and	O
database	O
on	O
which	O
users	O
can	O
integrate	O
various	O
add-ons	B-Application
and	O
plug-ins	B-Application
.	O
</s>
<s>
The	O
latter	O
communicates	O
via	O
Icinga	B-Protocol
's	O
Doctrine	B-Language
abstraction	O
layer	O
,	O
REST	O
and	O
plug-in	B-Application
APIs	B-General_Concept
–	O
that	O
mediate	O
between	O
the	O
external	O
data	O
and	O
internal	O
structures	O
.	O
</s>
<s>
This	O
bundling	O
of	O
components	O
allows	O
users	O
to	O
distribute	O
Icinga	B-Protocol
's	O
system	B-Application
for	O
redundant	O
monitoring	O
.	O
</s>
<s>
It	O
also	O
offers	O
users	O
freedom	O
to	O
customize	O
Icinga	B-Protocol
to	O
suit	O
their	O
needs	O
.	O
</s>
<s>
The	O
Icinga	B-Protocol
Core	O
manages	O
monitoring	O
tasks	O
,	O
receiving	O
check	O
results	O
from	O
various	O
plug-ins	B-Application
.	O
</s>
<s>
It	O
then	O
communicates	O
these	O
results	O
to	O
the	O
IDODB	O
(	O
Icinga	B-Protocol
Data	O
Out	O
Database	O
)	O
through	O
the	O
IDOMOD	O
(	O
Icinga	B-Protocol
Data	O
Out	O
Module	O
)	O
interface	O
and	O
IDO2DB	O
(	O
Icinga	B-Protocol
Data	O
Out	O
to	O
Database	O
)	O
service	O
daemon	O
over	O
SSL	O
encrypted	O
TCP	O
sockets	O
.	O
</s>
<s>
Icinga	B-Protocol
2	O
manages	O
monitoring	O
tasks	O
,	O
running	O
checks	O
,	O
sending	O
alert	O
notifications	O
.	O
</s>
<s>
The	O
Icinga	B-Protocol
2	O
features	O
can	O
be	O
enabled	O
on-demand	O
,	O
be	O
it	O
default	O
features	O
such	O
as	O
the	O
'	O
checker	O
 '	O
or	O
'	O
notification	O
 '	O
component	O
,	O
or	O
external	O
interfaces	O
compatible	O
with	O
Icinga	B-Protocol
1.x	O
and	O
its	O
user	O
interfaces	O
,	O
for	O
example	O
the	O
IDO	O
DB	O
(	O
Icinga	B-Protocol
Data	O
Out	O
Database	O
)	O
.	O
</s>
<s>
Icinga	B-Protocol
2	O
ships	O
a	O
built-in	O
cluster	O
stack	O
secured	O
by	O
SSL	O
x509	O
certificates	O
attempting	O
to	O
make	O
distributed	O
monitoring	O
setups	O
more	O
easy	O
.	O
</s>
<s>
The	O
configuration	O
syntax	O
is	O
different	O
to	O
Icinga	B-Protocol
Core	O
1.x	O
and	O
Nagios	B-Application
and	O
requires	O
a	O
migration	O
on	O
upgrade	O
.	O
</s>
<s>
Icinga	B-Protocol
offers	O
a	O
web	O
interface	O
for	O
users	O
to	O
view	O
monitoring	O
results	O
and	O
send	O
commands	O
to	O
the	O
Icinga	B-Protocol
Core	O
,	O
called	O
Icinga	B-Protocol
Web	O
(	O
also	O
referred	O
to	O
as	O
New	O
Web	O
)	O
is	O
the	O
project	O
's	O
Agavi	B-Language
and	O
PHP	B-Application
based	O
,	O
Web	O
2.0	O
inspired	O
front	B-Architecture
end	I-Architecture
that	O
uses	O
Cronks	O
(	O
widgets	O
)	O
to	O
offer	O
drag-n-drop	O
customized	O
dashboards	O
.	O
</s>
<s>
Icinga	B-Protocol
Web	O
is	O
a	O
standalone	O
piece	O
of	O
software	O
.	O
</s>
<s>
It	O
communicates	O
to	O
the	O
core	O
,	O
database	O
and	O
3rd	O
party	O
add-ons	B-Application
through	O
component	O
layers	O
:	O
Doctrine	B-Language
abstraction	O
layer	O
(	O
Input/Database	O
)	O
,	O
REST	O
API	B-General_Concept
(	O
external	O
scripts	O
)	O
and	O
Command	O
Control	O
Interface	O
(	O
writing	O
to	O
pipe	O
,	O
executing	O
commands	O
)	O
.	O
</s>
<s>
The	O
interface	O
presents	O
information	O
on	O
host	O
and	O
service	O
status	O
,	O
history	O
,	O
notifications	O
and	O
status	O
maps	O
to	O
show	O
the	O
health	O
of	O
a	O
network	O
in	O
real-time	O
and	O
also	O
supports	O
IPv4	B-Protocol
as	O
well	O
as	O
IPv6	B-Protocol
addresses	O
.	O
</s>
<s>
The	O
Icinga	B-Protocol
Data	O
Out	O
Database	O
(	O
IDODB	O
)	O
is	O
a	O
storage	O
point	O
for	O
historical	O
monitoring	O
data	O
for	O
add-ons	B-Application
or	O
the	O
Icinga	B-Protocol
Web	O
interface	O
to	O
access	O
.	O
</s>
<s>
In	O
contrast	O
to	O
its	O
predecessor	O
Nagios	B-Application
,	O
Icinga	B-Protocol
supports	O
PostgreSQL	B-Application
and	O
Oracle	B-General_Concept
databases	I-General_Concept
in	O
addition	O
to	O
MySQL	B-Application
.	O
</s>
<s>
The	O
Icinga	B-Protocol
project	O
offers	O
an	O
optional	O
Icinga	B-Protocol
Reporting	O
module	O
based	O
on	O
the	O
open	O
source	O
Jasper	B-Language
Reports	I-Language
.	O
</s>
<s>
It	O
can	O
be	O
integrated	O
into	O
both	O
Icinga	B-Protocol
Classic	O
and	O
Icinga	B-Protocol
Web	O
user	O
interfaces	O
.	O
</s>
<s>
Reports	O
can	O
also	O
be	O
viewed	O
in	O
both	O
of	O
Icinga	B-Protocol
's	O
optional	O
user	O
interfaces	O
.	O
</s>
<s>
Icinga	B-Protocol
Mobile	O
is	O
a	O
user	O
interface	O
for	O
smartphones	O
and	O
tablet	O
browsers	O
that	O
run	O
on	O
WebKit	B-Language
.	O
</s>
<s>
These	O
usually	O
are	O
available	O
on	O
iOS	B-Application
,	O
Android	B-Application
,	O
BlackBerry	B-Application
Tablet	I-Application
OS	I-Application
and	O
webOS	B-Operating_System
.	O
</s>
<s>
Based	O
on	O
JavaScript	O
and	O
Sencha	B-Language
Touch	I-Language
,	O
Icinga	B-Protocol
Mobile	O
is	O
downloaded	O
onto	O
a	O
server	O
for	O
access	O
by	O
authorized	O
users	O
via	O
their	O
mobile	O
devices	O
.	O
</s>
<s>
Icinga	B-Protocol
is	O
compatible	O
with	O
all	O
plug-ins	B-Application
and	O
the	O
majority	O
of	O
add-ons	B-Application
written	O
for	O
Nagios	B-Application
,	O
especially	O
for	O
users	O
opting	O
for	O
the	O
Icinga	B-Protocol
Classic	O
UI	O
.	O
</s>
<s>
Popular	O
add-ons	B-Application
to	O
extend	O
Icinga	B-Protocol
's	O
functionality	O
include	O
:	O
</s>
<s>
SNMP	B-Protocol
trap	O
monitoring	O
(	O
e.g.	O
</s>
<s>
Icinga	B-Protocol
has	O
been	O
successfully	O
deployed	O
in	O
large	O
and	O
complex	O
environments	O
with	O
thousands	O
of	O
hosts	O
and	O
services	O
,	O
in	O
distributed	O
and	O
failover	O
setups	O
.	O
</s>
<s>
The	O
software	O
's	O
modular	O
architecture	O
with	O
standalone	O
Core	O
,	O
Web	O
and	O
IDODB	O
(	O
Icinga	B-Protocol
Data	O
Out	O
Database	O
)	O
facilitate	O
distributed	O
monitoring	O
and	O
distributed	O
systems	O
monitoring	O
.	O
</s>
<s>
Nagios	B-Application
Remote	O
Plugin	B-Application
Executor	O
(	O
NRPE	O
)	O
is	O
an	O
Icinga	B-Protocol
compatible	O
agent	O
that	O
allows	O
remote	O
systems	O
monitoring	O
using	O
scripts	O
that	O
are	O
hosted	O
on	O
the	O
remote	O
systems	O
.	O
</s>
<s>
It	O
allows	O
for	O
monitoring	O
resources	O
such	O
as	O
disk	O
usage	O
,	O
system	B-Application
load	O
or	O
number	O
of	O
users	O
currently	O
logged	O
in	O
.	O
</s>
<s>
Icinga	B-Protocol
periodically	O
polls	O
the	O
agent	O
on	O
the	O
remote	O
system	B-Application
using	O
the	O
check_nrpe	O
plug-in	B-Application
.	O
</s>
<s>
In	O
setups	O
using	O
the	O
optional	O
Icinga	B-Protocol
Web	O
user	O
interface	O
,	O
monitoring	O
data	O
from	O
multiple	O
Icinga	B-Protocol
Core	O
instances	O
can	O
be	O
displayed	O
as	O
long	O
as	O
each	O
instance	O
writes	O
to	O
the	O
same	O
IDODB	O
.	O
</s>
<s>
At	O
a	O
structural	O
level	O
,	O
Icinga	B-Protocol
can	O
have	O
its	O
various	O
components	O
split	O
and	O
scattered	O
in	O
a	O
distributed	O
set	O
up	O
.	O
</s>
<s>
This	O
distributed	O
systems	O
monitoring	O
provides	O
greater	O
security	O
and	O
redundancy	O
;	O
if	O
one	O
component	O
were	O
to	O
fail	O
,	O
another	O
could	O
take	O
its	O
place	O
without	O
disrupting	O
the	O
entire	O
monitoring	O
system	B-Application
.	O
</s>
<s>
The	O
software	O
also	O
offers	O
a	O
fine-grained	O
authentication	O
system	B-Application
whereby	O
user	O
access	O
,	O
notifications	O
and	O
views	O
can	O
be	O
customized	O
to	O
the	O
detail	O
of	O
server	O
groups	O
,	O
servers	O
and	O
services	O
per	O
individual	O
.	O
</s>
