<s>
In	O
computer	B-General_Concept
science	I-General_Concept
,	O
a	O
single	B-Application
pushout	I-Application
graph	I-Application
rewriting	I-Application
or	O
SPO	O
graph	B-Application
rewriting	I-Application
refers	O
to	O
a	O
mathematical	O
framework	O
for	O
graph	B-Application
rewriting	I-Application
,	O
and	O
is	O
used	O
in	O
contrast	O
to	O
the	O
double-pushout	B-Application
approach	I-Application
of	O
graph	B-Application
rewriting	I-Application
.	O
</s>
