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Just a note regarding PDF:
PDF files are different, can be graphics base, can be multi-column layout, etc. which makes it next to useless on a 5" display.
However, *sometimes* it's just a tagged text which can be converted without problem with Calibre (1), Copy/Pasted (2) or even Saved-As Text (3) in Adobe Reader.
Thus, in addition to file format, also pay attention to its content format.
Hope it helps,
s.g.
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