(London :  Kegan Paul, Trench, Trübner & Co.,  1910.)

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 ``` CHAPTER XIII. 149 that in which all three pddas have the smallest pos¬ sible number of syllables, i.e. 4 -f 4 + 16, "The right-side number and the middle number we write down as we have done with the pddas of the two- pddoj metre, and we make with them the same calcula¬ tion as we have done above. Besides, we add the left¬ side number in a separate column, but do not make it undergo any changes. See the following scheme:— 4 4 16 4 5 15 4 6 14 4 7 13 4 8 12 4 9 II 4 10 10 4 II 9 4 1.2 8 4 13 7 4 14 6 4 15 5 4 16 4 "This gives the number of 13 permutations, but by changing the places of the numbers forwards and back¬ wards in the following method, the number may be increased sixfold, i.e. to 78 :— " I. The right-side number keeps its place ; the two other numbers exchange their places, so that the middle number stands at the leftside; the left-side number occupies the middle :— 1. 1 4 4 16 5 4 15 6 4 14 7 4 13 &c. "II.-III. The right-side number is placed in the middle between the other two numbers, which first ```