Several ads, one snippet per spot
This long article carries four snippets: one above the title, one after the second paragraph, one deeper in the body, and one at the very end. Each snippet places exactly one ad at its own position — ads never stack and never move.
Second paragraph. The snippet right below this text is the second ad spot, so its label
should be under_second_paragraph and its id 910.
Third paragraph. The ids the four snippets claim should read in document order — earlier spots claim earlier positions in the generated pool, later spots walk down through the incontent range.
Fourth paragraph of filler content that gives the deeper snippet a realistic distance from the one above it.
Fifth paragraph. Five of eight paragraphs precede the next snippet, which puts it in the long-content bucket territory.
Sixth paragraph, following the third ad spot.
Seventh paragraph as the article winds down toward the final placement.
Eighth and final paragraph. The last snippet sits below this text at the very end of the article — the bottom_of_page position.