<s>
A	O
multi-tape	B-Application
Turing	I-Application
machine	I-Application
is	O
a	O
variant	O
of	O
the	B-Architecture
Turing	I-Architecture
machine	I-Architecture
that	O
utilizes	O
several	O
tapes	O
.	O
</s>
<s>
-tape	O
Turing	B-Architecture
machine	I-Architecture
can	O
be	O
formally	O
defined	O
as	O
a	O
7-tuple	O
,	O
following	O
the	O
notation	O
of	O
a	O
Turing	B-Architecture
machine	I-Architecture
:	O
</s>
<s>
is	O
a	O
partial	B-Algorithm
function	I-Algorithm
called	O
the	O
transition	B-Application
function	I-Application
,	O
where	O
L	O
is	O
left	O
shift	O
,	O
R	O
is	O
right	O
shift	O
.	O
</s>
<s>
A	O
-tape	O
Turing	B-Architecture
machine	I-Architecture
computes	O
as	O
follows	O
.	O
</s>
<s>
Once	O
has	O
started	O
,	O
the	O
computation	O
proceeds	O
according	O
to	O
the	O
rules	O
described	O
by	O
the	O
transition	B-Application
function	I-Application
.	O
</s>
<s>
Two-stack	O
Turing	B-Architecture
machines	I-Architecture
have	O
a	O
read-only	O
input	O
and	O
two	O
storage	O
tapes	O
.	O
</s>
