Basic Guidelines For English Spellings
READ THESE ARTICLES
There are only ten verbs in general use with these endings but a lot of people have difficulty spelling them. It's best to try to learn the correct spellings, checking them in a dictionary if you aren't sure.
The most common ending is -cede:
accede
concede
intercede
precede
recede
secede
Only three words end in -ceed:
exceed
proceed
succeed
There's just one word that ends with -sede:
supersede