The word Lufing is misspelled against Luffing, which is present continuous of "Luff"
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Luffing has double "ff" is mispronounced as "f"
Remember double 'FF' in between the strings Lu & ing which should not be misspelled with single 'F'
Wrong Spelling: Lu-f-ing
Correct Spelling: Lu-ff-ing
Check more misspelled words of Luffing to spell it correct.