<s>
A	O
data	O
structure	O
has	O
key-independent	B-Data_Structure
optimality	I-Data_Structure
if	O
,	O
when	O
randomly	O
assigning	O
the	O
keys	O
,	O
the	O
expected	O
performance	O
of	O
the	O
data	O
structure	O
is	O
within	O
a	O
constant	O
factor	O
of	O
the	O
optimal	O
data	O
structure	O
.	O
</s>
<s>
Key-independent	B-Data_Structure
optimality	I-Data_Structure
is	O
related	O
to	O
dynamic	B-Data_Structure
optimality	I-Data_Structure
.	O
</s>
<s>
Splay	B-Data_Structure
trees	I-Data_Structure
are	O
known	O
to	O
have	O
key-independent	B-Data_Structure
optimality	I-Data_Structure
.	O
</s>
