The word Concurence is misspelled against Concurrence, meaning "Agreement."
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Concurrence has double "rr" is mispronounced as "r"
Remember double 'RR' in between the strings concu & ence which should not be misspelled with single 'R'
Wrong Spelling:  concu-r-ence 
Correct Spelling:  concu-rr-ence 
Check more misspelled words of Concurrence to spell it correct.