I was solving an IOL sample exercise (which can be found here) about the Aymara language. I did it, it was kinda hard but I did it. One of the words in it was challwampiwa.
The first part (challwa) is a root that means fish. There is a affix -mpi that appears whenever there was more than one kind of fish in the sentence, and an affix -wa that apears whenever the next word is challwataxa, the verb meaning to fish (the language is SOV).
My question is: how do we classify morphologically these affixes, how should one technically call them? And why should this -wa exist at all? Are there other languages with similar structures?