score candidate = character error + (optional) pixel drift penalty
Rather than fully removing the key from the map, we set the register value to null. The metadata is kept around so we can disambiguate deletions from states that simply don’t have a key yet. These are called tombstones — the ghosts of CRDTs past.
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Every Wednesday。业内人士推荐体育直播作为进阶阅读
分析：伊朗政權架構仍在運作，未來幾天將顯示它是否能夠撐下去
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