  The first two, apprehension and reproduction, are inseparable; one cannot occur without the other (A102). The third, recognition, requires the other two but is not required by them. It seems that only the third requires the use of concepts; this problem of non-concept-using syntheses and their relationship to use of the categories becomes a substantial issue in the second edition (see B150ff.), where Kant tries to save the universality of the objective deduction by arguing that all three kinds of syntheses are required to represent objects.