<s>
Stack	B-Algorithm
search	I-Algorithm
(	O
also	O
known	O
as	O
Stack	O
decoding	O
algorithm	O
)	O
is	O
a	O
search	O
algorithm	O
similar	O
to	O
beam	B-Algorithm
search	I-Algorithm
.	O
</s>
<s>
It	O
can	O
be	O
used	O
to	O
explore	O
tree-structured	O
search	O
spaces	O
and	O
is	O
often	O
employed	O
in	O
Natural	B-Language
language	I-Language
processing	I-Language
applications	O
,	O
such	O
as	O
parsing	O
of	O
natural	O
languages	O
,	O
or	O
for	O
decoding	O
of	O
error	B-Error_Name
correcting	I-Error_Name
codes	I-Error_Name
where	O
the	O
technique	O
goes	O
under	O
the	O
name	O
of	O
sequential	B-Error_Name
decoding	I-Error_Name
.	O
</s>
<s>
Stack	B-Algorithm
search	I-Algorithm
keeps	O
a	O
list	O
of	O
the	O
best	O
n	O
candidates	O
seen	O
so	O
far	O
.	O
</s>
<s>
Stack	B-Algorithm
search	I-Algorithm
is	O
not	O
guaranteed	O
to	O
find	O
the	O
optimal	O
solution	O
to	O
the	O
search	O
problem	O
.	O
</s>
