checking for duplicate values among five variables

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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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