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Piece table ([MS-DOC] 2.8.35 Clx / 2.8.36 PlcPcd): maps the logical character-position (CP) space onto WordDocument-stream byte offsets (FCs). Pieces are either 8-bit (Windows-1252) or 16-bit (UTF-16LE); both kinds can coexist in one document, and fast-saved files store text non-contiguously, so all text access must go through this table.