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What's the difference?

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All stages · Demo 185

DOI pattern

Choice journal / preprint / data. A DOI is `10.` plus 4–9 digits plus a slash. `10.1/x` never reaches Crossref.

ChoiceDOI regex after class

A plate. Nature and arXiv book; a one-digit registrant rejects.

replaykind —fmt —

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STANDBY

All 4056 stages

Educational stage on jev.page — not the official TypeSafe console. Live calls go to POST https://api.typesafe.ai/v1/systemone from your browser when you paste a key. Without a key, the stage plays a recorded decision shaped like jev-1.13.0. Jev does not write the UI copy.