<Tr> <Td> 7 </Td> <Td> BP Bhatt </Td> <Td> 23 April 1965 </Td> <Td> 22 April 1968 </Td> </Tr> <Tr> <Td> 8 </Td> <Td> RP Nayak </Td> <Td> 31 April 1968 </Td> <Td> 15 November 1969 </Td> </Tr> <Tr> <Td> 9 </Td> <Td> MV Desai </Td> <Td> 12 December 1969 </Td> <Td> 19 October 1970 </Td> </Tr> <Tr> <Td> 10 </Td> <Td> R Srinivasan </Td> <Td> 20 October 1970 </Td> <Td> 15 November 1971 </Td> </Tr>

What is the difference between u and u/a