 The proposition expressed by 36(a) seems to be exemplified by minimal past situations in which Josephine built an airplane, and this set of situations is quantized. On the other hand, the proposition expressed by 36(b) seems to be exemplified by all past situations that contain airplane flying by Josephine and nothing else, and this set of situations is homogeneous. Homogeneous sets cannot be used as counting domains, however, and this requires adjustments with examples like 37(b).