fa'a FAhA4 cmavo

location tense relation/direction; arriving at/directly towards ...

On affix form:

farna
x1 is the direction of x2 (object/event) from origin/in frame of reference x3.

In notes:

backla
b1=k1 goes beyond destination b2=k2 from origin k3 via route k4 using means/vehicle k5.
velsudu
x1 has a speed of x2 space units covered in x3 time period; x1 has the magnitude of velocity measured by x2 (space units) traversed in time x3 (event)