<s>
In	O
computer	B-General_Concept
science	I-General_Concept
a	O
doubly	B-Data_Structure
logarithmic	I-Data_Structure
tree	I-Data_Structure
is	O
a	O
tree	B-Application
where	O
each	O
internal	O
node	O
of	O
height	O
1	O
,	O
the	O
tree	B-Application
layer	O
above	O
the	O
leaves	O
,	O
has	O
two	O
children	O
,	O
and	O
each	O
internal	O
node	O
of	O
height	O
has	O
children	O
.	O
</s>
<s>
A	O
similar	O
tree	B-Application
called	O
a	O
k-merger	O
is	O
used	O
in	O
Prokop	O
et	O
al	O
.	O
</s>
<s>
'	O
s	O
cache	B-Application
oblivious	I-Application
Funnelsort	B-Algorithm
to	O
merge	O
elements	O
.	O
</s>
