This has been probably the most frustrating chapter yet with validation. I've tested numerous data sets with my algorithm. It tries starting with all words in the list and returns the longest result. It's worked with everything I've thrown at it, even the ones you guys have suggested. I think the most frustrating part of CodeGym is we don't get to see the dataset that's failing validation. I wish they would provide the test samples they use so I can SEE where my results differ from theirs. Since that's not possible, anyone have any explanations?