Task: Error-Detect (source dataset: Relational-Tables)

Task: 
You are given a column of data from a table. Your job is to examine each value in the column, and identify if there is any clear data error in the column. An data error in the context of the column, can be values that are misspelled (typos), values that are formatted incorrectly, or values that are semantically incompatible with the rest of the column, etc., such that we can determine without ambiguity that such values are errors in the column. 

Since real-world data can vary widely in meaning and format, if you are uncertain whether a value is an error, please do not mark it as one. Only flag a value if you are confident that it is clearly a data error.

No explanation and return the final answer as a JSON object, {"obvious_error": "<CELL>"}. If you detect no error in the data, return {"obvious_error": null}.

Column:
| monthdateyear   |
|:----------------|
| apr-25-21       |
| apr-26-21       |
| apr-27-21       |
| apr-28-21       |
| apr-29-21       |
| apr-30-21       |
| may-01-21       |
| may-02-21       |
| may-03-21       |
| may-04-21       |
| may-05-21       |
| may-06-21       |
| may-07-21       |
| may-08-21       |
| may-09-21       |
| may-10-21       |
| may-11-21       |
| may-12-21       |
| may-13-21       |
| may-14-21       |
| may-15-21       |
| may-16-21       |
| may-17-21       |
| may-18-21       |
| may-19-21       |
| may-20-21       |
| may-22-21       |
| may-23-21       |
| may-24-21       |
| may-25-21       |
| may-26-21       |
| may-27-21       |
| may-28-21       |
| may-29-21       |
| may-30-21       |
| may-31-21       |
| jun-01-21       |
| jun-02-21       |
| jun-03-21       |
| jun-04-21       |
| jun-05-21       |
| jun-06-21       |
| jun-07-21       |
| jun-08-21       |
| jun-09-21       |
| jun-10-21       |
| jun-11-21       |
| jun-12-21       |
| jun-13-21       |
| jun-14-21       |
| jun-15-21       |
| jun-16-21       |
| jun-17-21       |
| jun-18-21       |
| jun-19-21       |
| jun-20-21       |
| jun-21-21       |
| jun-22-21       |
| jun-23-21       |
| jun-24-21       |
| jun-25-21       |
| jun-26-21       |
| jun-27-21       |
| jun-28-21       |
| jun-29-21       |
| jun-30-21       |
| jul-01-21       |
| jul-02-21       |
| jul-03-21       |
| jul-04-21       |
| jul-05-21       |
| jul-06-21       |
| jul-07-21       |
| aug-16-21       |
| aug-17-21       |
| aug-18-21       |
| aug-19-21       |
| aug-20-21       |
| aug-21-21       |
| aug-22-21       |
| aug-23-21       |
| aug-24-21       |
| aug-25-21       |
| aug-26-21       |
| aug-27-21       |
| aug-28-21       |
| aug-29-21       |
| aug-30-21       |
| aug-31-21       |
| sep-01-21       |
| sep-02-21       |
| sep-03-21       |
| sep-04-21       |
| sep-05-21       |
| sep-06-21       |
| sep-07-21       |
| sep-08-21       |
| sep-09-21       |
| sep-10-21       |
| sep-11-21       |
| sep-12-21       |
| sep-13-21       |
| sep-14-21       |
| sep-15-21       |
| sep-16-21       |
| sep-17-21       |
| sep-18-21       |
| sep-19-21       |
| sep-20-21       |
| sep-21-21       |
| sep-22-21       |
| sep-23-21       |
| sep-24-21       |
| sep-25-21       |
| sep-26-21       |
| sep-27-21       |
| sep-28-21       |
| sep-29-21       |
| sep-30-21       |
| oct-01-21       |
| oct-02-21       |
| oct-03-21       |
| oct-04-21       |
| oct-05-21       |
| oct-06-21       |
| oct-07-21       |
| oct-08-21       |
| oct-09-21       |
| oct-10-21       |
| oct-11-21       |
| oct-12-21       |
| oct-13-21       |
| oct-14-21       |
| oct-15-21       |
| oct-16-21       |
| oct-17-21       |
| oct-18-21       |
| oct-19-21       |
| oct-20-21       |
| oct-21-21       |
| oct-22-21       |
| oct-23-21       |
| oct-24-21       |
| oct-25-21       |
| oct-26-21       |
| oct-27-21       |
| oct-28-21       |
| oct-29-21       |
| oct-30-21       |
| oct-31-21       |
| nov-01-21       |
| nov-02-21       |
| nov-03-21       |
| nov-04-21       |
| nov-05-21       |
| nov-06-21       |
| nov-07-21       |
| nov-08-21       |
| nov-09-21       |
| nov-10-21       |
| nov-11-21       |
| nov-12-21       |
| nov-13-21       |
| nov-14-21       |
| nov-15-21       |
| nov-16-21       |
| nov-17-21       |
| nov-18-21       |
| nov-19-21       |
| nov-20-21       |
| nov-21-21       |
| nov-22-21       |
| nov-23-21       |
| nov-24-21       |
| nov-25-21       |
| nov-26-21       |
| nov-27-21       |
| nov-28-21       |
| nov-29-21       |
| nov-30-21       |
| dec-01-21       |
| dec-02-21       |
| dec-03-21       |
| dec-04-21       |
| dec-05-21       |
| dec-06-21       |
| dec-07-21       |
| dec-08-21       |
| dec-09-21       |
| dec-10-21       |
| dec-11-21       |
| dec-12-21       |
| dec-13-21       |
| dec-14-21       |
| dec-15-21       |
| dec-16-21       |
| dec-17-21       |
| dec-18-21       |
| dec-19-21       |
| dec-20-21       |
| dec-21-21       |
| dec-22-21       |
| dec-23-21       |
| dec-24-21       |
| dec-25-21       |
| dec-26-21       |
| dec-27-21       |
| dec-28-21       |
| dec-29-21       |
| dec-30-21       |
| dec-31-21       |
| jan-01-22       |
| jan-02-22       |
| jan-03-22       |
| jan-04-22       |
| jan-05-22       |
| jan-06-22       |
| jan-07-22       |
| jan-08-22       |
| jan-09-22       |
| jan-10-22       |
| jan-11-22       |
| jan-12-22       |
| jan-17-22       |
| jan-15-21       |
| jan-16-21       |
| jan-17-21       |
| jan-18-21       |
| jan-19-21       |
| jan-20-21       |
| jan-21-21       |
| jan-22-21       |
| jan-23-21       |
| jan-24-21       |
| jan-25-21       |
| jan-26-21       |
| jan-27-21       |
| jan-28-21       |
| jan-29-21       |
| jan-30-21       |
| jan-31-21       |
| feb-01-21       |
| feb-02-21       |
| feb-03-21       |
| feb-04-21       |
| feb-05-21       |
| feb-06-21       |
| feb-07-21       |
| feb-08-21       |
| feb-09-21       |
| feb-10-21       |
| feb-11-21       |
| feb-12-21       |
| feb-13-21       |
| feb-15-21       |
| feb-16-21       |
| feb-17-21       |
| feb-18-21       |
| feb-19-21       |
| feb-20-21       |
| feb-21-21       |
| feb-22-21       |
| feb-23-21       |
| feb-24-21       |
| feb-25-21       |
| feb-26-21       |
| feb-27-21       |
| feb-28-21       |
| mar-01-21       |
| mar-02-21       |
| mar-03-21       |
| mar-04-21       |
| mar-05-21       |
| mar-06-21       |
| mar-07-21       |
| mar-08-21       |
| mar-09-21       |
| mar-10-21       |
| mar-11-21       |
| mar-12-21       |
| mar-13-21       |
| mar-14-21       |
| mar-15-21       |
| mar-16-21       |
| mar-17-21       |
| mar-18-21       |
| mar-19-21       |
| mar-20-21       |
| mar-21-21       |
| mar-22-21       |
| mar-23-21       |
| mar-24-21       |
| mar-25-21       |
| mar-26-21       |
| mar-27-21       |
| mar-28-21       |
| mar-29-21       |
| mar-30-21       |
| mar-31-21       |
| apr-01-21       |
| apr-02-21       |
| apr-03-21       |
| apr-04-21       |
| apr-05-21       |
| apr-06-21       |
| apr-07-21       |
| apr-08-21       |
| apr-09-21       |
| apr-10-21       |
| apr-11-21       |
| apr-12-21       |
| apr-13-21       |
| apr-14-21       |
| apr-15-21       |
| apr-16-21       |
| apr-17-21       |
| apr-18-21       |
| apr-19-21       |
| jul-08-21       |
| jul-10-21       |
| jul-11-21       |
| jul-12-21       |
| jul-13-21       |
| jul-14-21       |
| jul-15-21       |
| jul-16-21       |
| jul-17-21       |
| jul-19-21       |
| jul-20-21       |
| jul-21-21       |
| jul-22-21       |
| jul-23-21       |
| jul-24-21       |
| jul-25-21       |
| jul-26-21       |
| jul-27-21       |
| jul-28-21       |
| jul-29-21       |
| jul-30-21       |
| aug-01-21       |
| aug-03-21       |
| aug-04-21       |
| aug-05-21       |
| aug-06-21       |
| aug-07-21       |
| aug-08-21       |
| aug-09-21       |
| aug-10-21       |
| aug-11-21       |
| aug-13-21       |
| aug-14-21       |
| jan-13-22       |
| jan-14-22       |
| jan-15-22       |
| jan-16-22       |
| jan-18-22       |
| jan-19-22       |
| jan-20-22       |
| jan-21-22       |
| jan-22-22       |
| jan-23-22       |
| jan-24-22       |
| jan-25-22       |
| jan-26-22       |
| jan-27-22       |
| jan-28-22       |
| jan-29-22       |
| jan-30-22       |
| jan-31-22       |
| feb-01-22       |
| feb-02-22       |
| feb-03-22       |
| feb-04-22       |
| feb-05-22       |
| feb-06-22       |
| feb-07-22       |
| feb-08-22       |
| feb-09-22       |
| feb-10-22       |
| feb-11-22       |
| feb-12-22       |
| feb-13-22       |