<s>
In	O
computer	B-General_Concept
science	I-General_Concept
,	O
a	O
pagoda	B-Application
is	O
a	O
priority	B-Application
queue	I-Application
implemented	O
with	O
a	O
variant	O
of	O
a	O
binary	O
tree	O
.	O
</s>
<s>
The	O
basic	O
operation	O
is	O
merge	O
or	O
meld	O
,	O
which	O
maintains	O
the	O
heap	B-Application
property	I-Application
.	O
</s>
