[companion question here]
I was given an 11x11x11 Rubik's cube as a gift. It came with a guide book that I have been following to solve the cube.
After solving four of the 9x9 sub-centers of the cube, and after solving the 5x5 sub-centers of the remaining two faces, the guidebook prompts to solve the 7x7 sub-centers. There is an error in the guide book notation, where it has duplicate algorithms (circled in red) to "swap" two different pairs of pieces:
I have not tested either of these duplicate algorithms yet, but I am guessing that the center-right circled algorithm is correct, and need a new algorithm for the bottom left one in the image.