<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_chunk(self,x,z):
 """ Return a chunk specified by the chunk coordinates x,z. Raise InconceivedChunk if the chunk is not yet generated. To get the raw NBT data, use get_nbt. """

        return self.chunkclass(self.get_nbt(x, z))