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#!/usr/bin/env perl
 
use 5.014;
...
    }
    close $fh;
}

al.txt:
abel
abel
...
fargo
golfer
jerky

al has 8 unique words
bob has 7 unique words
...
     baker appears in  2 files: al, bob
     kappa appears in  1 file : carmen
      abel appears in  1 file : al