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What's the difference?

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All stages · Demo 175

EIN pattern

Choice corp / nonprofit / estate. The hyphen is the whole test. Nine digits with no dash never reach a taxpayer table.

ChoiceUS EIN regex

An IBAN-style two-block strip. 12-3456789 books a corp; 123456789 rejects on sight.

replaykind —fmt —

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.