<s>
In	O
coding	B-Error_Name
theory	I-Error_Name
,	O
Zemor	O
's	O
algorithm	O
,	O
designed	O
and	O
developed	O
by	O
Gilles	O
Zemor	O
,	O
is	O
a	O
recursive	O
low-complexity	O
approach	O
to	O
code	O
construction	O
.	O
</s>
<s>
Zemor	O
considered	O
a	O
typical	O
class	O
of	O
Sipser	O
–	O
Spielman	O
construction	O
of	O
expander	B-Error_Name
codes	I-Error_Name
,	O
where	O
the	O
underlying	O
graph	O
is	O
bipartite	O
graph	O
.	O
</s>
<s>
In	O
matrix	O
,	O
let	O
is	O
equal	O
to	O
the	O
second	O
largest	O
eigenvalue	O
of	O
adjacency	B-Algorithm
matrix	I-Algorithm
of	O
.	O
</s>
<s>
Zemor	B-Error_Name
's	I-Error_Name
decoding	I-Error_Name
algorithm	I-Error_Name
finds	O
it	O
difficult	O
to	O
decode	O
erasures	O
.	O
</s>
