cu'uxna fu'ivla

x1 is aware that x1 can be in relation x4 with all of x3 (plural) and choose to be in relation x4 with x2 (which is among x3)

To summarize, "x1 chooses x2 out of set x3 to do/have relationship x4 (binary ka)". See also cuxna

In notes:

uxna
x1 chooses x2 out of x3 for being the thing x1 will be in relation x4 with.