Enklactify these strings
Python 2, 68 67 61 bytes



lambda a:`{0:j for j in zip(*a)if len(set(j))==len(j)}`[6::5]


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Improvements


From 68 bytes to 67 bytes by Jo King
From 66 to 65 bytes by Lynn




If output would not have to be a string:

Python 3, 49 bytes



lambda a:[j for j in zip(*a)if len({*j})==len(j)]


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