Unique characters: Difference between revisions
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=={{header|Mathematica}}/{{header|Wolfram Language}}==
<lang Mathematica>Select[Tally[Sort[Characters[StringJoin[{"133252abcdeeffd", "a6789798st", "yxcdfgxcyz"}]]]], Last /* EqualTo[1]][[All, 1]]</lang>
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<pre>{"1", "5", "6", "b", "g", "s", "t", "z"}</pre>
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