This lesson completed the four grades of obscurity:
Khafi: difficulty applying clear wording to a special case; investigate.
Mushkal: a more obscure use of the expression; investigate and reflect.
Mujmal: the intended sense needs clarification by the speaker; act on the ambiguous aspect after that clarification.
Mutashabih: the strongest concealment; refrain from unsupported specification and accept the true intended meaning.
Remember that understanding a general word and judging whether a novel case fits it are different acts. So are reasoned reflection and authoritative clarification.
The next level begins the fourth division: ʿibarat al-nass, isharat al-nass, dalalat al-nass and iqtidaʾ al-nass.