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These new algorithms "Remove parts by length" and "Remove parts by area" filter out parts of geometries from a vector layer, by checking their area or length vs a minimum size parameter. If the input geometry is a multipart geometry, then the parts will be filtered by their individual sizes. If no parts match the required minimum size, then the feature will be skipped and omitted from the output layer. If the input geometry is a singlepart geometry, then the feature will be skipped if the geometry's size is below the required size and omitted from the output layer. Attributes are not modified.