A string of length
on an alphabet of
characters is an ordered arrangement of not necessarily distinct symbols from , where
and are nonnegative
integers. There are
such distinct strings for .
There is one string of length 0, called the empty string or empty word,
even when the alphabet is empty.
For example, the strings of length on the alphabet are ,
, , ,
, , ,
and .
In the Wolfram Language, the corresponding sequences of length
over the alphabet consisting of the members of a list
can be enumerated as lists using Tuples[list,
n].
on an alphabet 
of 
characters is an ordered arrangement of 
not necessarily distinct symbols from 
, where 
and 
are nonnegative
integers. There are 
such distinct strings for 
.
There is one string of length 0, called the empty string or empty word,
even when the alphabet is empty.
on the alphabet 
are 
,
, 
, 
,
, 
, 
,
and 
.
over the alphabet consisting of the members of a list 
can be enumerated as lists using Tuples[list,
n].
