 Single Column Analyses (Exercise 3)
owner is never null or blank and is 4 characters long.beneficiary:
3 to 5 digit characters long; no blank value but there are multiple
values (45.75%) which pattern is only one digit long, and all of these
values are 0, which means there is no beneficiary for this contract, so the contract owner is also the beneficiary.begin_dt and end_dt are never null.
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