in reply to confused with summing certain elements from an array

Your data description appears to be wrong. I count 2 'b's, not 1 or 3. I count 3 'a's, not 2. I count 2 'c's, not 3. I certainly don't count 4 'f's.

As for solving the problem, to work with parallel arrays, you'll need to use a loop to walk over all of them. For example:

my %hash; for(my $i; $i < @out; $i++) { # do something with $out[$i]; # do something with $out1[$i]; }

In the body of the loop you'll need to populate that hash. Think about what should be your key and what should be your value.

Good luck!