Get unique sorted combobox on userfrom

Hello everybody
I have a form with four comboboxes and the row source for them columns("A:D")
I need a sorted and unique values for each combobox.
Here's an attachment

If you just want unique and sorted then

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Excellent Mr. Jindon
You are always perfect and awesome
Thank you very much

Hello Mr YasserKhalil
I appreciate your care about my question
and Thank your Mr Jindon for your help
Thank You
Best Regards
(Yasser El-Shiekh)

Thanks Mr Jindon
Last point if possible .. What if I need Combobox2 only to be unique and sorted and reamins all the other comboboxes as they are
I tried this code

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And I got my result but the other comboboxes has no elements ..
Thanks advanced

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Thanks a lot Mr Jindon for this great help and words are unable to express my thanks.