Currier B aiin and Latin in

In the Latin ISE corpus, the word 'in' is the second most frequent word, and it would be surprising if this word was not among the top ten words of any Latin text of significant length. The word 'in' also has the property that it is rarely followed by another high-frequency word. The reason for this is that 'in' is a preposition, and is therefore usually followed by a noun with high semantic content, and those words are generally lower in frequency than function words.

Despite the fact that it is rarely followed by another high-frequency word, 'in' is commonly preceded by another high-frequency word, particularly 'et', 'est' or 'ut'. This can be seen in the frequencies by which the top ten most frequent words appear together:

In Currier B the word 'aiin' has similar properties. It is the fourth most frequent word, and has the property that it is rarely followed by another high-frequency word, but is commonly preceded by one. This can be seen in the frequencies by which the top ten most frequent words appear together:

The word 'in' appears not only in Latin, but also in Tuscan and Spanish, though with somewhat lower frequency. In Dante's Divina Commedia, for example, it is the 11th most common word. I assume the drop in frequency between Latin and Tuscan was due to the loss of case markers on nouns, which would have required a corresponding increase in the number of prepositions (since otherwise distinctions such as in urbe / in urbem were lost).

The situation with Latin and Tuscan could be compared to the situation with Currier B and Currier A. The word 'aiin' also appears in Currier A, though with a lower frequency, being the 17th most common word.