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Using LISP: Define a function occurrences that takes a list and returns a list indicating the number of times each element appears (use eql to

Using LISP:

Define a function occurrences that takes a list and returns a list indicating the number of times each element appears (use eql to compare), sorted most common element to least common. For example:

> (occurrences '(a b a d a d)) ((A . 3) (D . 2) (B . 1))

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