This is to say—and here I follow Black's characterization of the doctrine—logic is something of a universal grammar or, more strictly, providing a universal grammar is one of the tasks of logic. Other philosophers of the Baghdad school like Yahyâ ibn ‘Adî (d. 974) by and large adopt Alfarabi's doctrine (see Endress 1977, 1978; cf. Black 1991: 48ff). (I think Alfarabi was being impelled towards holding that the subject matter of logic is secondary intelligibles, and perhaps ultimately came to hold such a doctrine (see Menn 2012: 68; Alfarabi Kitâb al-Hurûf [1970] 64, 66–67), but the position described above represents the doctrine Avicenna was to react against.)