The word Percused is misspelled against Percussed, which is past tense of "Percuss"
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Percussed has double "ss" is mispronounced as "s"
Remember double 'SS' in between the strings percu & ed which should not be misspelled with single 'S'
Wrong Spelling:  percu-s-ed 
Correct Spelling:  percu-ss-ed 
Check more misspelled words of Percussed to spell it correct.