Question: Two columns can have identical values ( i . e . same values in each row of those two columns ) Two columns can have

Two columns can have identical values (i.e. same values in each row of those two columns)
Two columns can have the same names
Two rows can have identical values (i.e. same values in each column of those two rows)
Values in the same column can be from different domains
None of the above is true

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