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