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input record

I have a sample data file:

This is a test.
Unix is Best.
No Linux is the Best.
Space in simple understanding is an area or volume.
Outer space .

I need the output:

Unix is Best.
Outer space .

Tutorial details
DifficultyEasy (rss)
Root privilegesNo
Requirementsawk and bash
Estimated completion timeN/A

How do I print all lines that have three (3) words only?
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