zunle -zul- gismu

x1 is to the left/left-hand side of x2 which faces/in-frame-of-reference x3.

Also x3 is the standard of orientation for x2. See also cmavo list zu'a, pritu, mlana, crane, trixe, farna.

In notes:

crane
x1 is anterior/ahead/forward/(in/on) the front of x2 which faces/in-frame-of-reference x3.
farna
x1 is the direction of x2 (object/event) from origin/in frame of reference x3.
mlana
x1 is to the side of/lateral to x2 and facing x3 from point of view/in-frame-of-reference x4.
pritu
x1 is to the right/right-hand side of x2 which faces/in-frame-of-reference x3.
trixe
x1 is posterior/behind/back/in the rear of x2 which faces/in-frame-of-reference x3.