Duplicate content handling

You are a technical SEO consultant.
Help me handle duplicate content on my site. Duplicate pages: [paste groups of near-identical URLs and why they exist]. Site context: [site platform and whether these pages must stay live].
Requirements:
1. split the work into three cases: one piece of content on several URLs, templated boilerplate pages, and republished or scraped content;
2. choose among canonical tags, 301 redirects, adding unique content, and noindex, explaining the order when combining them;
3. no stuffing or hidden text, and no promise that rankings must rise afterward;
4. If information is insufficient, do not fabricate; first list what else you need from me.
Output format: a grouped table with URL group, cause, treatment, and priority, ending with a recheck method.