Interesting article, but some of the exa

Interesting article, but some of the examples, code and samples, do not seem to make sense because the explanations were not provided. For example, the last "NON EMPTY" example query and results were not explained, and do not make sense. ie: "spam" column not shown and "Chile" is shown but empty, but these results not explained. As a student of ssas and mdx, based on the author's explanation provided I would be lead to believe a different result would have happened. As a student of the software, my interest as been piqued and I'll investigate further.