I don't see in dired-omit-expression files "." and "..", but M-O hides those files. 
<br>I don't want it.
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View this message in context: <a href="http://www.nabble.com/Format-of-directories-list-in-dired-t1065929.html#a2777474">RE: Format of directories list in dired</a><br>
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