A water-utility dump contains two identical meter rows and a third that differs by a single transposed digit the rule treats as a near duplicate. Policy allows zero. Which dataset constraint should the tester apply?

Two identical meter rows plus a third that differs by one transposed digit, when policy allows zero, need a multi-value duplicate constraint for identical or near-identical rows. A type constraint hunts the word “crowded,” a range constraint hunts -4 turbidity, and allowing the twins ignores the policy.