docs: def copy(self):
          """Return a copy of a MOC.
  
          >>> p = MOC(4, (5, 6))
          >>> q = p.copy()
          >>> repr(q)
          '<MOC: [(4, [5, 6])]>'
          """
  
          copy = MOC(name=self.name, mocid=self.id,
                     origin=self.origin, moctype=self.type)
  
          copy += self
  
          return copy