Hi there! Apologies for the super late reply The way renga works is that it is a series of haiku/senryu that can also include tanka (which is what the last one is). Generally renga is done between multiple poets, where one writes a haiku, and another writes a haiku in response (and so on), though the term renga can still be used when describing a series of haiku that are interconnected. So in this case, since all three are on the same subject, I group them together as a renga. I hope that clears things up!