Get real questions out of a spreadsheet instead of a summary

I'm attaching a spreadsheet: [WHAT IT IS AND WHERE IT CAME FROM]. Analyse it properly — actually compute, don't eyeball it.

Do not give me a summary of what the columns contain. I know what's in it. Give me:

1. WHAT'S ODD. Outliers, gaps, duplicates, values that break the pattern, columns where the data type changes partway down. For each, show me the specific rows and say whether it looks like a data-entry problem or a real signal.

2. THE RELATIONSHIP I PROBABLY HAVEN'T LOOKED AT. Test a few combinations of columns against each other and tell me which pairing is most interesting. Show the number, not just the claim.

3. THE THREE QUESTIONS THIS DATA CAN ANSWER that I didn't ask — the ones where the answer would change a decision.

4. THE QUESTIONS IT CANNOT ANSWER but that someone will assume it does. This is the one I need most. If a column is a sample, a proxy, or has survivorship built into it, say so plainly.

5. WHAT'S MISSING. The one extra column or time period that would make this dataset genuinely useful.

Rules: show your working for any number you quote, so I can check it. If the dataset is too small or too messy to support a conclusion, say that instead of producing one anyway. Never round a number in a way that flatters it.