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formula-detangler

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Untangle the spreadsheet formula nobody dares touch — decompose the seven-function nest into named readable steps, explain what it actually does (vs. what it's believed to do), and rebuild it maintainably with helper columns and modern functions. Use when asked what does this formula do, this IFERROR-VLOOKUP monster broke, make this formula maintainable, or nobody understands the sheet the analyst left. Produces the plain-language decode, the step decomposition into helper columns, the believed-vs-actual gaps, and the rebuilt version.

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Nov 9, 2026

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Nov 9, 2026
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MIT

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# Formula Detangler Skill

Every long-lived sheet grows one: the 400-character nest of IFs inside IFERROR inside INDEX-MATCH that one departed analyst understood — now load-bearing, feared, and edited by no one. Detangling is decompilation: read it inside-out, name each layer's job in plain language, check the *believed* behavior against the *actual* (the gaps are where the sheet has been quietly wrong), then rebuild as steps a successor can read — helper columns with named headers beat heroic one-liners in every sheet that outlives its author.

## What This Skill Produces

- **The decode** — the formula's actual behavior in plain language, layer by layer
- **The believed-vs-actual gaps** — where what it does differs from what the team thinks it does (the silent-wrong findings)
- **The decomposition** — the nest split into named helper-column steps, each testable alone
- **The rebuild** — modern equivalents (LOOKUP-family upgrades, IFS over IF-chains) where the platform allows, with the migration check

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