But that's the thing, part of the plan was in a bad case we can switch to manual processing, but at no point someone thought to suggest manually processing one

But that's the thing, part of the plan was in a bad case we can switch to manual processing, but at no point someone thought to suggest manually processing one failing plan I work with great QAs all day, and if one of them heard that there are duplicate area codes, there would be a bunch of test cases appearing with all the possible combinations