Take this values of $a and $b: 

$a = 12;
$b = 2;

[download]

From his words:

if $a does not match $b

I assume he wouldn't want to put the 2 in $a, as $a already matches $b.

In reply to Re^2: Replace $a with $b if $a ne $b by cog
in thread Replace $a with $b if $a ne $b by Anonymous Monk

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