Ommision of Vowels

I was wondering why some words omit the vowels, even when they are stressed. For example, the word "incline" is written "e n". The disjoined e only makes the incl sound, so why is there no simple for the hard 'i' sound? I'd think you'd write it "e i-n". Same thing wish the "sup(e)r-" prefix. The why isn't the "ee" sound in supreme written? How does one know to omit it? Thanks



(by _pie_man_ for everyone)
 

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