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#1

Hey everyone, I'm new and I'm not sure where this question should go, but I'm gambling it should go in the puzzle theory section.

I've recently solved a 4x4 via the common method of reducing it to a 3x3 by making the centers and pairing up the edges. However I was unable to fix the parities for some time without referring blindly to some algorithms found online until I read the 'understanding parity' thread about even and odd numbers of inner layer quarter turns. So far I've only figured out how to fix the PLL parity where there are 2 swapped corners, but I'm still unable to do the OLL error where I have one 'dedge' flipped (without blindly following some algorithm). My question is, as far as I'm aware, are not both errors caused by having performed an odd numer of inner layer quarter turns? Because the method I have for fixing my PLL error is obviously not working for the OLL error. So then what exactly is different between the OLL and PLL parity cases? Thx!

I've recently solved a 4x4 via the common method of reducing it to a 3x3 by making the centers and pairing up the edges. However I was unable to fix the parities for some time without referring blindly to some algorithms found online until I read the 'understanding parity' thread about even and odd numbers of inner layer quarter turns. So far I've only figured out how to fix the PLL parity where there are 2 swapped corners, but I'm still unable to do the OLL error where I have one 'dedge' flipped (without blindly following some algorithm). My question is, as far as I'm aware, are not both errors caused by having performed an odd numer of inner layer quarter turns? Because the method I have for fixing my PLL error is obviously not working for the OLL error. So then what exactly is different between the OLL and PLL parity cases? Thx!