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11

Yet another one, with all 16 words different: (I admit that this is a computer-assisted answer, in the sense that I wrote a program to extract the list of 4-letter heteropalindromes from YAWL. I constructed the square manually from that list.) For side information: there are only 16 unique such squares containing 16 unique words (not counting rotations and ...


7

Deuosvi had already posted an answer, but I couldn't stop myself when I found another one:


13

One solution meeting your requirements:


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