Hi Charles! Thanks so much for taking the time to read and respond. I’m sorry you didn’t get what you wanted out of the article, and I’ll try to do better next time. Personally, I really liked Kent’s approach to using a simple Boolean filter approach, as it wasn’t something I realized was possible — so when I found a use for it, I wrote up the article. And you have my sincere my thanks for catching that punctuation typo! Cheers.