code: def find_base_style(masters):
      
      if not masters:
          return ""
      base_style = (masters[0].name or "").split()
      for master in masters:
          style = master.name.split()
          base_style = [s for s in style if s in base_style]
      base_style = " ".join(base_style)
      return base_style
docs: Find a base style shared between all masters.
      Return empty string if none is found.