The test is almost identical to that for Exercise 13.11, except that the vector length test is eliminated (since a vector is not used to represent queue elements).
When your queue ADT is implemented correctly, the output should be:
************************************************************** Results for Exercise 13.13 Assertion OK: (= (head queue) 5) Assertion OK: (= (head queue) 14) Assertion OK: (empty-queue? queue)
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