<Tr> <Td> Betrayal </Td> <Td> 12 </Td> <Td> 000000001999 - 10 - 12 - 0000 October 12, 1999 </Td> <Td> 47--49 (35--37 edited) </Td> </Tr> <Tr> <Td> Collision </Td> <Td> 13 </Td> <Td> 000000001999 - 10 - 12 - 0000 October 12, 1999 </Td> <Td> 50--53 (38--40 edited) </Td> </Tr> <Tr> <Td> Quest </Td> <Td> 14 </Td> <Td> 000000001999 - 11 - 09 - 0000 November 9, 1999 </Td> <Td> 54--56 (41--43 edited) </Td> </Tr> <Tr> <Td> Trouble! </Td> <Td> 15 </Td> <Td> 000000001999 - 11 - 09 - 0000 November 9, 1999 </Td> <Td> 57--59 (44--46 edited) </Td> </Tr>

How many episodes are in a season of dragon ball z