<s>
In	O
computer	B-General_Concept
science	I-General_Concept
,	O
a	O
substring	B-Algorithm
index	I-Algorithm
is	O
a	O
data	B-General_Concept
structure	I-General_Concept
which	O
gives	O
substring	O
search	O
in	O
a	O
text	O
or	O
text	O
collection	O
in	O
sublinear	O
time	O
.	O
</s>
<s>
The	O
phrase	O
full-text	B-Application
index	O
is	O
also	O
often	O
used	O
for	O
an	O
index	O
of	O
all	O
substrings	O
of	O
a	O
text	O
.	O
</s>
<s>
But	O
is	O
ambiguous	O
,	O
as	O
it	O
is	O
also	O
used	O
for	O
regular	O
word	O
indexes	O
such	O
as	O
inverted	B-Algorithm
files	I-Algorithm
and	O
document	B-Algorithm
retrieval	I-Algorithm
.	O
</s>
<s>
See	O
full	B-Application
text	I-Application
search	I-Application
.	O
</s>
<s>
Substring	B-Algorithm
indexes	I-Algorithm
include	O
:	O
</s>
