I don't think the histogram works on non-numeric data.
So examine the attached.
This was done by the following steps;
1. Copy the data to column C.
2. Remove the duplicates from column C only. (Function under the data tab).
3. In column B, add the function =Countif(range, C1) range is the range in column A(use absolute refs).
4. Then fill-down the countif function.
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