What if more than one person with the same name visits the same number of couuntries? :) I think that to cover all possible cases there should be 3 ordering criterions

"We always have to see both categories in the results, even if one or both of the counts is zero."

updated sample test. tnx!

don't have much time today :/. Putting kata into draft and will carefully work with all issues when have time (and re-check my solution because looks that it has issues)...Very interesting problem

yes, you are absolutely right :/ I just updated initially without thinking deeply. It should not be possible to be sold more than purchased

fixed :)

updated the Notes section of description as answers to your questions

done :) Thanks for the approvals of all previous katas! ^^

yes :/ fixed test

agree. Made these adjustments in test

updated description and tests to invalidate such solutions

added such a test. thank you for the feedback!

Since we established that the situation "F-word_F-word" is impossible due to the nature of the voice recognition software (in tests there are no such cases), I think that different handling of such cases is irrelevant.

updated sample test and the description

it is expected. I added a note to the description.