In Pseudo-Code:
open file1
loop over file 1
extract each $word
$results{$word} = 1
end-loop
close file1
open file2
loop over file2
extract each $word
$results{$word" += 2 #### Note: '+=', not '='
end-loop
close file2
##
### %results contains all of the words in both files.
### Words that appear in both files will have a value of '3'.
### Iterate over the %results keys and print only the
### when the value is '3'.
##
----
I Go Back to Sleep, Now.
OGB
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