Twenty questions in thirds

Hide a number. Each question asks which third it lies in; the answers are its trits, top first. 243 numbers take 5 questions instead of 8.

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Where the numbers come from

gHashTag/t27 specs/ternary/trits.t27 (t27#8979): every value on the page is its fn bodies, compiled to wasm (logic.js), with 18 tests and 4108 runtime asserts

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