<s>
An	O
edge	B-Data_Structure
list	I-Data_Structure
is	O
a	O
data	B-General_Concept
structure	I-General_Concept
used	O
to	O
represent	O
a	O
graph	O
as	O
a	O
list	O
of	O
its	O
edges	O
.	O
</s>
<s>
The	O
entire	O
edge	B-Data_Structure
list	I-Data_Structure
may	O
be	O
represented	O
as	O
a	O
two-column	O
matrix	O
.	O
</s>
<s>
An	O
edge	B-Data_Structure
list	I-Data_Structure
may	O
be	O
considered	O
a	O
variation	O
on	O
an	O
adjacency	B-Data_Structure
list	I-Data_Structure
which	O
is	O
represented	O
as	O
a	O
length	O
array	O
of	O
lists	O
.	O
</s>
<s>
Since	O
each	O
edge	O
contains	O
just	O
two	O
or	O
three	O
numbers	O
,	O
the	O
total	O
space	O
for	O
an	O
edge	B-Data_Structure
list	I-Data_Structure
is	O
.	O
</s>
