def &

    array & other_array
Set Intersection—Returns a new array containing elements common to the two arrays, with no duplicates.
   [ 1, 1, 3, 5 ] & [ 1, 2, 3 ]   #=> [ 1, 3 ]

  end

This is just a stub for a builtin Ruby method. See the top of this file for more info.
def foo

Stuff
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Stuff
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