<Table> Electric Toothbrush Manufacturers <Tr> <Th> Manufacturer </Th> <Th> Manufacturer Country </Th> </Tr> <Tr> <Td> Forte </Td> <Td> Italy </Td> </Tr> <Tr> <Td> Dent - o - Fresh </Td> <Td> USA </Td> </Tr> <Tr> <Td> Kobayashi </Td> <Td> Japan </Td> </Tr> <Tr> <Td> Hoch </Td> <Td> Germany </Td> </Tr> </Table> <Tr> <Th> Manufacturer </Th> <Th> Manufacturer Country </Th> </Tr> <Tr> <Td> Forte </Td> <Td> Italy </Td> </Tr> <Tr> <Td> Dent - o - Fresh </Td> <Td> USA </Td> </Tr>

Which of the following must be true for a relation to be in 2nf