code: def get_mnemonics(self, mnemonics, uwis=None, alias=None):
          
          # Let's not do the nested comprehension...
          uwis = uwis or self.uwis
          wells = [w for w in self.__list if w.uwi in uwis]
          all_wells = []
          for w in wells:
              this_well = [w.get_mnemonic(m, alias=alias) for m in mnemonics]
              all_wells.append(this_well)
          return all_wells
docs: Looks at all the wells in turn and returns the highest thing
          in the alias table.
  
          Args:
              mnemonics (list)
              alias (dict)
  
          Returns:
              list. A list of lists.