If doubtful about ie or ei, in the event the sound on the vowel is as in brief /i:/, we spell it ie; but following the letter c, we spell it ei: … is shortened to male and ouevre is shortened to euver. That's where by the spelling of maneuver https://spellingrules18406.theblogfairy.com/27773103/5-easy-facts-about-spelling-error-by-dear-sir-described