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sicp-all-tasks/sicp/4_002e68

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Exercise 4.68: Define rules to implement the
reverse operation of Exercise 2.18, which returns a list
containing the same elements as a given list in reverse order. (Hint: Use
append-to-form.) Can your rules answer both (reverse (1 2 3) ?x)
and (reverse ?x (1 2 3))?