<s>
PORS	B-General_Concept
stands	O
for	O
Plus	O
One	O
Recall	O
Store	O
.	O
</s>
<s>
It	O
is	O
a	O
problem	O
used	O
in	O
evolutionary	O
computation	O
and	O
genetic	B-Algorithm
programming	I-Algorithm
.	O
</s>
<s>
The	O
PORS	B-General_Concept
language	O
consists	O
of	O
two	O
terminal	O
nodes	O
(	O
1	O
and	O
recall	O
)	O
,	O
one	O
unary	O
operation	O
(	O
store	O
)	O
and	O
one	O
binary	O
operation	O
(	O
plus	O
)	O
that	O
together	O
make	O
up	O
a	O
parse	O
tree	O
that	O
calculates	O
a	O
number	O
.	O
</s>
