Redesign the query language as a nondeterministic program to be implemented usingthe evaluator, rather than as a stream process. In this approach, each query will producea single answer (rather than the stream of all answers) and the user can type try-again to see moreanswers. You should find that much of the mechanism we built in this section is subsumed bynondeterministic search and backtracking. You will probably also find, however, that your new querylanguage has subtle differences in behavior from the one implemented here. Can you find examplesthat illustrate this difference?
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