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            "description": "Only include assignments with an assignor execution date on/after this ISO date (`YYYY-MM-DD`). Applies to all modes."
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          "conveyanceTypeContains": {
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            "description": "Case-insensitive substring filter on the conveyance/transaction type, e.g. `security`, `merger`, `assignment`, `change of name`."
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              "34",
              "35",
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