I noticed the 4 input K-map is read differently from a 3 input K-map.
I am assuming the A, not A, B, not B, C , not C , D and not D are located differently in a 4 input K-Map.

Can anyone explain where these locations are located on a 4 input K map?
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There is article about Karnaugh map in Wikipedia. This is layout of map for 4 variables:
K-map for 4 variables.