Door hinge questions??

Ok, Im a little stumped here. I have a few upper and lower door hinges. Im trying to figure out drivers side and passenger side. If you take a look at the 1st pic, it shows 4 upper hinges. All but one have either a "P" or an "R" stamped in them. One I cant make anything out on.
Question #1...if you take a look at them, the upper hinge on the left actually swings the other way. How can that work for the same side of the vehicle?? That one is stamped and I can make out a "P" or an "R". If you see in the 2nd pic there are 2 uppers side by side, one marked R and one marked P, but they swing or mount opposite?? Im stumped.....

Now for the lower hinges, 3rd pic shows all of the lower hinges. Only 1 I can tell has a marking on it. In the 4th pic you can see it stamped "R" which I would think means passenger side. So does that mean all these are passenger side hinges, or can they be flip flopped for passenger side to drivers side. Thanks for all the help.
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