The word Cobed is misspelled against Cobbed, which is past tense of "Cob"
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Cobbed has double "bb" is mispronounced as "b"
Remember double 'BB' in between the strings Co & ed which should not be misspelled with single 'B'
Wrong Spelling:  Co-b-ed 
Correct Spelling:  Co-bb-ed 
Find more incorrect spellings of Cobbed to spell right way.