The word Sentineling is misspelled against Sentinelling, which is present continuous of "Sentinel"
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Sentinelling has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings sentine & ing which should not be misspelled with single 'L'
Wrong Spelling: sentine-l-ing
Correct Spelling: sentine-ll-ing
Find more wrongly spelled words of Sentinelling to spell it well.