In (info "(coreutils)comm invocation"), after:
With no options, `comm' produces three-column output. Column one
contains lines unique to FILE1, column two contains lines unique to
FILE2, and column three contains lines common to both files. Columns
are separated by a single TAB character.
The options `-1', `-2', and `-3' suppress printing of the
corresponding columns. Also see *note Common options::.
Please add: If two of them are used, the separator is no longer needed
and will not be printed.
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