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  1. or download this
    @A = ("Red", "Green", "Yellow");
@B = ("Yellow", "Black","Yellow","Red", "White", "Yellow");
  2. or download this
    > Red at index 3
> Green is missing
> Yellow at index 0, 2 and 5
> Elements from B were detected 4 times in A
  3. or download this
    foreach $x (@A){
    foreach $y (@B){
...
    }
  }
}