checking for duplicate values among five variables

[Kenn Murrah <kenn@xxxxxxxxxxxxxxxxxxx>]

Can anyone help me with a way to determine of two or more variables have 
the same value?  For instance,

$a1 = 1000
$a2 = 2000
$a3 = 2000
$a4 = 4000
$a5 = 5000

I want check these five variables and determine whether, as in this 
case, two or more of the variables  have the same value.

Any suggestions how I can do this?

Thanks in advance.

kenn

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