CGEL page 100: Doubling of consonant before -ing and -ed

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xorg

Member
Portuguese Brazil
Definitions
CGEL = A Comprehensive Grammar of the English Language
ISBN-13: 978-0582517349

I'm reading the book CGEL. The image below is a copy of page 100, precisely last topic of that page.



Green Part I understand.
Blue part I do not understand.

How to one vowel is spelled in single letter?
How to one vowel is not spelled in single letter?


My primary language is Portuguese. I signed up on this forum because of excellent posts I read here!

Thanks!
 
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