Contains fictional records of 7 persons.
Two data frames with resp. 6 and 5 records and 6 columns.
id the id of the person; this contains no errors and can be used to
validate the linkage.
lastname the last name of the person; contains errors.
firstname the first name of the persons; contains errors.
address the address; contains errors.
sex the sex; contains errors and missing values.
postcode the postcode; contains no errors.
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