Parity 1: Edge is flipped
This is the annoying of the two parities. Like you would get a cross on the 3x3, this parity makes it a T instead.
To fix this turn one inner face of the flipped edge, turn the edges so you can replace them with the 3 edge cycle, then swap
the centers back with the algorithm from the first page.


Parity 2: 2 Swapped Corners
This one is much easier to fix. Place the two corners that need to be swapped in the bottom fron, and do this algorithm:

The top face will now be slightly scrambled again. Use your 3x3 technique to get the cross on top again.
This time, two edges will need to be fixed:

All you need to do is hold the cube so one of the edges is in the front top, and the other right behind it in the back
top, and do this algorithm:

Once you have that, just cycle and rotate the corners as necessary like on a 3x3 cube and you're done! Congratulations!
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