how to combine phrases - remove duplicates - and remove words with specific length

The problem I have is simple for a human to solve, but I'm having a hard time figuring out how to make excel do the same thing.

I have phrases in each cell B2:F2

...and what I want to do is the following:

take all of the individual words between B2:F2
remove duplicate words
remove words under 4 characters long
take remaining words and post one word per cell between I2:R2

I have en example in the excel file that shows the outcome I would like to have excel give.

Thank you for the help