The word Buttresing is misspelled against Buttressing, which is present continuous of "Buttress"
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Buttressing has double "ss" is mispronounced as "s"
Remember double 'SS' in between the strings buttre & ing which should not be misspelled with single 'S'
Wrong Spelling: buttre-s-ing
Correct Spelling: buttre-ss-ing
Check more misspelled words of Buttressing to spell it correct.