In The Complete Guide to Spelling by John J Fulford, he writes "With double consonants, the division is between the two consonants unless they are at the end of the word. Never split a blend or digraph."
He then gives the following examples.
- suc/cess
- ill/ness
- ac/cid/ent
- suck/ing
Is it just me or did he immediately break this rule will "illness"? The way it's broken up makes logical sense but why?