okay, im just starting to learn to solve the 4x4, and i had a question on the edge pairing step. im doing the one where you solve 2 edge pairs at a time, though i can only solve them if they are in a certain case, and i do the alg- r U' r U R' r' (i dont know the notation for turning 2 layers at once...) anyway, I was wondering if you guys had a link or something that had all the cases for solving 2 edge pairs at once, and what to do. Or anything just to help me out here. thanks