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Show how MapReduce can be used to efficiently solve the following problem: Given a collection of input documents, output all pairs of keywords that co-occur

Show how MapReduce can be used to efficiently solve the following problem:

Given a collection of input documents, output all pairs of keywords that co-occur in at least 1000 of the documents.

Write pseudocode for map and reduce functions.

Full points for most efficient implementation.

Hint: is multi-phase MapReduce useful here?

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