For two animals, people (actor muɴ- & theme) to come upon each other (loc ref), as two men on a trail.
Munhihippul: focus is on three or more who or which come upon each other.
hipul
For someone (actor -um- & theme; s actor maN- & theme) to come upon someone, something (loc ref -on) by chance, as upon men fighting, wine ready for drinking, food prepared for eating.
manippul; hippūlon
Humippul: focus is on someone who eventually comes upon someone else, something by chance.
Himmippul hi Gem'oh hi lāman hi inalāhan ti adi humiga an gun umuy manganup.
Gem'oh eventually came upon a wild pig in the forest because he doesn't become bored in continually going to hunt.
-on: hippūlon