Definition:
Let
x
and
y
be two strings over
S
.
The
concatenation
of
x
and
y
is
xy
.
Note:
x
e
=
e
x
=
x
Examples:
Concatenation of
101
and
001
is
101
001
Concatenation of
e
and
001
is
e
001
=
001
Concatenation of Strings
Gist:
xy
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