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$value1 = "a";
$value2 = "b";
...

$key = join("", $value1,$value2,$value3,$value4,$value5);
print $key;

my $str = "v1=$value1,v2=$value2,v3=$value3,v4=$value4,v5=$value5";
# use $str for key, or perhaps generate hash of $str and use that