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(it) doesn't bother me at all
I have no objection to this. Sure, you can open the window in here—it doesn't bother me at all.
history repeats itself
Said when something that has happened in the past recurs in the present. Can be used in the negative to mean the opposite. And, once again, I got dumped. History repeats itself. The home team has lost their last three game sevens, so I bet they're hoping that history doesn't repeat itself tonight.
the left hand doesn't know what the right hand is doing
In a situation or setting in which people are working together, certain people in the organization are ignorant of the actions of certain other people in the organization, leading to dysfunction. The contradictory emails I've gotten from that company lead me to believe that the left hand doesn't know what the right hand is doing.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
History repeats itself.
Prov. The same kinds of events seem to happen over and over. It seems that history is about to repeat itself for that poor country; it is about to be invaded again. Alan: The country is headed for an economic depression. Jane: How do you know? Alan: History repeats itself. The conditions now are just like the conditions before the last major depression.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.