The word Estoping is misspelled against Estopping, which is present continuous of "Estop"
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Estopping has double "pp" is mispronounced as "p"
Remember double 'PP' in between the strings esto & ing which should not be misspelled with single 'P'
Wrong Spelling:  esto-p-ing 
Correct Spelling:  esto-pp-ing 
Find more incorrect spellings of Estopping to spell right way.