<s>
Oscillating	B-Algorithm
merge	I-Algorithm
sort	I-Algorithm
or	O
oscillating	B-Algorithm
sort	I-Algorithm
is	O
a	O
variation	O
of	O
merge	B-Algorithm
sort	I-Algorithm
used	O
with	O
tape	O
drives	O
that	O
can	O
read	O
backwards	O
.	O
</s>
<s>
The	O
oscillating	B-Algorithm
merge	I-Algorithm
sort	I-Algorithm
does	O
not	O
waste	O
rewind	O
time	O
or	O
have	O
tape	O
drives	O
sit	O
idle	O
as	O
in	O
the	O
conventional	O
tape	O
merge	O
.	O
</s>
<s>
The	O
oscillating	B-Algorithm
merge	I-Algorithm
sort	I-Algorithm
"	O
was	O
designed	O
for	O
tapes	O
that	O
can	O
be	O
read	O
backward	O
and	O
is	O
more	O
efficient	O
generally	O
than	O
either	O
the	O
polyphase	B-Algorithm
or	O
cascade	O
merges.	O
"	O
</s>
