temp_left=deepcopy(l)
        temp_left._next=None
        temp_left._prev=None

        temp_right=deepcopy(r)
        temp_right._next=None
        temp_right._prev=None

        newfront=False
        newrear=False

        if(l._prev is None):
            newfront=True
        if r._next is None:
            newrear=True

        if l._prev is not None:
            l._prev._next=temp_right
            temp_right._prev=l._prev

        l._next._prev=temp_right
        temp_right._next=l._next

        if r._next is not None:
            r._next._prev=temp_left
            temp_left._next=r._next

        r._prev._next=temp_left
        temp_left._prev=r._prev

        if newfront:
            self._front=temp_right

        if newrear:
            self._rear=temp_left

        return