11.3: How many 'levels' deep?

[thohae]

Two follow-up questions:
(1) Where does rule 11.3 state or imply that the casts

including their cv-qualifiers

must match? Isn't the rule about correct alignment and removing qualifiers is prohibited by rule 11.8 while adding qualifiers is allowed (according to example 2 of rule 11.3)?
(2) Could you please add a example for

However the cv-qualifiers ( cv1 and cv2 in your example ) at the top level may differ.

?