Hi ,
The Hash can hold only unique keys and hence you can store the key as the split string .
my $txt1 = "0101010101";
my $count;
my %hashofuniq;
my @txt1 = split ('',$txt1);
@hashofuniq{@txt1} = 1;
foreach (keys %hashofuniq){
$count++;
}
print "[$count]\n";
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