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What's the difference?

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All stages · Demo 327

Czech rodné číslo

Choice rc / tmp / other. Ten digits must be divisible by 11. Jev never divides. Nine digits need 10.

ChoiceRC mod-11 in JS

A digit tape. 8501010012 books a Czech plate. A last-digit flip rejects. Nine digits never pass.

replaykind —rc —

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.