1. 1 on class
2. 1 in notes

On grammatical class:

xi

subscript; attaches a numer of letteral string following as a subscript onto grammar structures.

In notes:

xoi

1. to the degree of...When prefixed by a number, turns the number into a selbri that expresses some truth value between zero and one, inclusive. 2. it may or may not be the case that ...