Definition: The function ALTN1 and ALTN2 represent strictly families of functions which generate alternative pluralities respectively. Such alternative pluralities are auxiliary constructs representing collections of entities from which at least one member (in the case of ALTN1) or exactly one member (in the case ALTN2) has to be selected in order to interpret a situation comprising such a plurality as a participant.

eg ALTN1: “The program can work with numbers, letters or special characters”.
In this case, the “or”could also be interpreted as an “and”.