Given a sentence in Chinese, provide an equivalent paraphrased translation in English that retains the same meaning both through the translation and the paraphrase.

Q:

A: Searching a specific search tree according to a binary key can be recursively or iteratively programmed .
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Q: 1916,5756

A: The first five weapons were delivered in the first half of 1916 . A total of 57 barrels and 56 carriages were completed by the end of the war .
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Q: ,

A:
We consider pseudo-differential operators here as a generalization of differential operators .
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