Last but not least, here is a learning support on gray areas in comma use. This is the fifteenth of fifteen posts carrying learning supports–presented seriatim in the order, sorted by major subheadings, from the punctuation manual from which they are excerpted. If you click here, you will end up back at the first posted support, titled “An Introductory Learning Support on Using the Comma.” From there, you scroll up to find them in order. Each post indicates which is which in the sequence.
If you want it, here is the table of contents for all fifteen of the learning supports in this chain.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.