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Suppose we have a collection if 100 documents, in which: 30 documents contain term computer 80 documents contain term information 90 documents contain term science

Suppose we have a collection if 100 documents, in which:

30 documents contain term "computer"
80 documents contain term "information"
90 documents contain term "science"
5 documents contain term "library"

What is the posting lengths (document frequencies) of the following terms:

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