perl match and sort unique result

I have a file that contain the following, Is there an easy to sort the unique result?
XXXXXX ClientId=CCC
XXXXXX ClientId=AAA
XXXXXX ClientId=AAA
XXXXXX ClientId=BBB
XXXXXX ClientId=AAA

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use v5.10.0;
my $file= shift @ARGV;
my $c=0;
my @clientids;

open (my $fh1, '<', $file);
foreach my $line (<$fh1>) {
	chomp $line;
	say (@clientids) $1 if $line =~ /ClientId=(\w+)/;
	$c++;
}

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Expected Result:
ClientId=AAA
ClientId=BBB
ClientId=CCC

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LVL 21
MazdajaiAsked:
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ozoCommented:
perl -lane '++$c{$F[-1]};END{print for sort keys %c}' file
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MazdajaiAuthor Commented:
Thanks. :)

Your line make mine look silly! :(
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