XML : Why does my android project suddenly has two dimens.xml and two styles.xml files?

I am new to android and trying to code an app with AndroidStudio on Ubuntu 14.04. Today I relalite I have two dimens.xml and two styles.xml as follows:

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Why does that happen? What have I done? What should I do now, shall I leave them as it is, or should I adjust it?

To clarify: I did not create those files, I cannot reconstruct when they popped up first.

Also, those files do not seem to exist in the directory values, but there are directories values-21 and values-w820dp, probably created in last October already!

I am - again - completely confused by android and I appreciate help to clarify what is going on....

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