I want to replace an older "round" outlet with a new square one. On the back of the old outlet there are two holes where I am used to seeing only one. So, there are two holes on the top left, two on the top right, two on the bottom left and two on the bottom right. I have three white and three black wires coming out of the wall. When I look into the receptacle in the wall, there are two sets (a black and a white) coming from the bottom of the receptacle and one set coming from the right hand side - none from the top.
I don't know how to connect all the wires to a normal outlet and I am unable to locate any new outlets that have this many holes in it. Help, please.

