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2021-01-15 compared with 2019-12-23 · 1 added, 2 removed, 14 unchanged (18% of the section changed)
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.