| Rating | Solver | Clue |
|---|---|---|
| ASCERTAIN | Discover (truth) | |
| PROOF | Any effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial. | |
| EXPERIMENT | ... disprove something doubtful; esp., one under conditions determined by the experimenter; an act or operation undertaken in order to discover ... | |
| EXAMINE | To test by any appropriate method; to inspect carefully with a view to discover the real character or state of; to subject to inquiry or inspec... |