# An array is written like @days and can be thought
    #    of as a list of values
    @days               # ($days[0], $days[1],... $days[n])

    # Arrays can be sliced, and a slice of a literal list
    #    is the same as taking a slice of something that
    #    returns a list (in this case a range operator)
    @days[3,4,5]        # same as @days[3..5]

    # Hash lookups can also be sliced, and a slice of a
    #    literal list is the same as taking a literal
    #    list of lookups.
    @days{'a','c'}      # same as ($days{'a'},$days{'c'})

    # You write a hash like %days, and you can think of
    #    it as a list of key/value pairs.
    %days               # (key1, val1, key2, val2 ...)