<s>
*	O
hierarchy	O
is	O
a	O
major	O
class	O
of	O
newsgroups	B-Application
in	O
Usenet	B-Application
,	O
containing	O
all	O
newsgroups	B-Application
whose	O
name	O
begins	O
with	O
"	O
comp	O
.	O
</s>
<s>
NewsgroupTopic	O
comp.ai	O
artificial	B-Application
intelligence	I-Application
comp.arch	O
computer	O
architecturecomp.bbsBulletin	O
board	O
system	O
system	O
discussion	O
and	O
advertisement	O
comp.dcom.telecom	O
telecommunications	O
systems	O
comp.dsp	O
Digital	B-General_Concept
signal	I-General_Concept
processing	I-General_Concept
comp.graphics.apps.photoshop	O
Adobe	B-Operating_System
Photoshop	I-Operating_System
,	O
Illustrator	B-Language
,	O
and	O
InDesign	B-Operating_System
.	O
</s>
<s>
comp.graphics.api.opengl	O
OpenGL	B-Application
comp.infosystems.gemini	O
Gemini	B-Protocol
space	I-Protocol
comp.internet.services.wiki	O
Wikis	B-Protocol
comp.lang.asm.x86	O
assembly	B-Language
language	I-Language
for	O
x86-based	O
computer	O
systems	O
.	O
</s>
<s>
NewsgroupTopic	O
comp.sources.unix	O
Postings	O
of	O
public-domain	O
sources	O
for	O
Unix	B-Application
.	O
</s>
<s>
(	O
Moderated	O
)	O
comp.windows.newsDiscussion	O
about	O
Sun	O
Microsystems	O
NeWS	O
and	O
PostScript	B-Language
related	O
technologies	O
.	O
</s>
<s>
a	O
newsgroup	B-Application
about	O
Windows	B-Application
and	O
Microsoft	O
.	O
</s>
