Senyepa se nang le letheka le phahameng ho bopa letheka, mpa le thekeng. E entsoe ka lesela la tekheniki, e tiisa ho khomarela ka ho feteletseng ho hlalosa le ho ntlafatsa li-curve tsa tlhaho. Liaparo tsa ka tlaase tse bōpang li phethahetse tlas'a seaparo se senyenyane se setšo kapa liaparo tse thata.