## Problem 304 — rank:196

**Title:** Origin or origins of viruses

**Added binding assumptions (LaTeX):**

```latex
Take $\ell^*$ as a supremum unless likelihood attainment is established, and calibrate $\delta$ before calling a likelihood region a confidence set. The finite ancestral-node bound imposes a prior structural ceiling on origin counts, not an observation-derived upper bound. Independent viral organization and module ancestry need distinct counting rules. A change in homology or transfer assumptions can alter which organizations count as independent even before parameter fitting.
```

**Direct edits:** 1. **Fresh external checks:** None; supplied sources retained as provenance.