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awk NF example

Linux / Unix: Sed / Grep / Awk Print Lines If It Got 3 Words Only

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 .

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