<Tr> <Td> Elite Pizza </Td> <Td> Capital City </Td> </Tr> <Tr> <Td> Vincenzo's Pizza </Td> <Td> Springfield </Td> </Tr> <Tr> <Td> Vincenzo's Pizza </Td> <Td> Shelbyville </Td> </Tr> <P> In contrast, if the pizza varieties offered by a restaurant sometimes did legitimately vary from one delivery area to another, the original three - column table would satisfy 4NF . </P>

When is a relation said to be 4nf