Any bright ideas to write an expression to filter records of "Customers who have ONLY been to France & Mexico" in the below table ?
| Customers | Country |
|---|---|
| Bob | Mexico |
| Bob | France |
| Bob | Japan |
| John | US |
| Ken | France |
| Ken | Japan |
| Cathy | US |
| Cathy | France |
| Cathy | Mexico |
| Cathy | Japan |
| Mark | Mexico |
| Mark | US |