Tanāzuʿ: two verbs seek a relation with one later overt noun.
Four patterns: subject/subject, object/object, subject/object, object/subject.
Iʿmāl: one verb governs the overt noun; the other verb’s required role must still be accounted for by a pronoun or, when appropriate, omission.
Preference: Basrans favor the second verb, Kufans the first; the book reports an al-Farrāʾ exception for patterns 1 and 3.