Dear all,
My 6/7 year olds have recently been exploring when suffixes force doubling and I think I found an exception.
edit + ing --> editing
This word seems to adhere to all the steps on the flow chart. Any ideas?

Also, I was of the understanding that all syllables need a vowel, until I stumbled upon "rhythm"- 1 vowel, 2 syllables.

I look forward to hearing your theories.