 If we perform a simple calculation based on the four categorical sentences and the four figures, we find that there are 256 possible combinations of sentences. Of these, 24 have traditionally been thought to yield valid deductions. To the 19 already mentioned we must add two subalternate moods in the first figure (Barbari and Celaront), two subalternate moods in the second figure (Camestrop and Cesaro), and one subalternate mood in the fourth figure (Camenop).