Main article.
When we determine the number of vowels, we wish to retain the possibility of constructing other combinations of 100 letters; we write down each hundred in a square with ten rows and ten columns maintaining the order of the letters:
Next, we count how many vowels there are in each column taken separately and join the numbers in pairs:
In this way, we obtain five numbers for each 100 letters, which we denote with the following symbols:
and the following sum:
represents the total number of vowels in this hundred.