Prefered or Preferred: How To spell?

The word Prefered is misspelled against Preferred, which is past tense of "Prefer"

--> Preferred has double "rr" is mispronounced as "r"
Remember double 'RR' in between the strings prefe & ed which should not be misspelled with single 'R'
Wrong Spelling:  prefe-r-ed 
Correct Spelling:  prefe-rr-ed 
Explore spell check of Preferred to spell without errors.

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