In the previous chapter, we covered the deferred Standard Query Operators. These are easy to spot because they return either IEnumerable<T> or OrderedSequence<T>. But the deferred operators are only half the Standard Query Operator story. For the full story, we must also cover the nondeferred query operators. A nondeferred operator is easy to spot because it has a return data type other than IEnumerable<T> or OrderedSequence<T>. These nondeferred operators are categorized in this chapter by their purpose.
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