<Tr> <Th> Severus Snape </Th> <Td_colspan="4"> Alan Rickman </Td> <Td_colspan="1"> Alan Rickman Alec Hopkins </Td> <Td_colspan="2"> Alan Rickman </Td> <Td_colspan="1"> Alan Rickman Benedict Clarke </Td> </Tr> <Tr> <Th> Pomona Sprout </Th> <Td_colspan="1"> </Td> <Td_colspan="1"> Miriam Margolyes </Td> <Td_colspan="5"> </Td> <Td_colspan="1"> Miriam Margolyes </Td> </Tr> <Tr> <Th> Sybill Trelawney </Th> <Td_colspan="2"> </Td> <Td_colspan="1"> Emma Thompson </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Emma Thompson </Td> <Td_colspan="2"> </Td> <Td_colspan="1"> Emma Thompson </Td> </Tr> <Tr> <Th_colspan="9"> <H3> Hogwarts students </H3> </Th> </Tr>

Who plays all the characters in harry potter